American Century Asset Allocation Portfolios N-CSR 26 Sep 24 Certified annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
	Jul. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	AMERICAN CENTURY ASSET ALLOCATION PORTFOLIOS, INC.
Entity Central Index Key	0001293210
Entity Investment Company Type	N-1A
Document Period End Date	Jul. 31, 2024

Shareholder Report

Shareholder Report	12 Months Ended	41 Months Ended	46 Months Ended	81 Months Ended	106 Months Ended	112 Months Ended
	Jul. 31, 2024 USD ($) holding	Jul. 31, 2024 USD ($) holding	Jul. 31, 2024 USD ($) holding	Jul. 31, 2024 USD ($) holding	Jul. 31, 2024 USD ($) holding	Jul. 31, 2024 USD ($) holding
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	AMERICAN CENTURY ASSET ALLOCATION PORTFOLIOS, INC.
Entity Central Index Key	0001293210
Entity Investment Company Type	N-1A
Document Period End Date	Jul. 31, 2024
C000225681 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2015 Portfolio
Class Name	Investor Class
Trading Symbol	AAAFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2015 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $60 0.57%
Expenses Paid, Amount	$ 60
Expense Ratio, Percent	0.57%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2015 Portfolio Investor Class returned 9.27% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 9.27% 2.27% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date 2015 9.56% 3.14% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 12,560
Investment Company, Portfolio Turnover	37%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 46.8% Domestic Equity Funds 29.6% International Fixed Income Funds 13.2% International Equity Funds 10.4% Other Assets and Liabilities 0.0%
C000225682 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2015 Portfolio
Class Name	I Class
Trading Symbol	AAAHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2015 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $39 0.37%
Expenses Paid, Amount	$ 39
Expense Ratio, Percent	0.37%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2015 Portfolio I Class returned 9.49% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 9.49% 2.44% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date 2015 9.56% 3.14% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 12,560
Investment Company, Portfolio Turnover	37%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 46.8% Domestic Equity Funds 29.6% International Fixed Income Funds 13.2% International Equity Funds 10.4% Other Assets and Liabilities 0.0%
C000225683 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2015 Portfolio
Class Name	A Class
Trading Symbol	AAAJX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2015 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $86 0.82%
Expenses Paid, Amount	$ 86
Expense Ratio, Percent	0.82%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2015 Portfolio A Class returned 9.01% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 9.01% 2.00% 3/10/21 A Class - with sales charge 2.74% 0.23% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date 2015 9.56% 3.14% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 12,560
Investment Company, Portfolio Turnover	37%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 46.8% Domestic Equity Funds 29.6% International Fixed Income Funds 13.2% International Equity Funds 10.4% Other Assets and Liabilities 0.0%
C000225684 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2015 Portfolio
Class Name	R Class
Trading Symbol	AAAKX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2015 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $112 1.07%
Expenses Paid, Amount	$ 112
Expense Ratio, Percent	1.07%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2015 Portfolio R Class returned 8.75% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 8.75% 1.73% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date 2015 9.56% 3.14% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 12,560
Investment Company, Portfolio Turnover	37%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 46.8% Domestic Equity Funds 29.6% International Fixed Income Funds 13.2% International Equity Funds 10.4% Other Assets and Liabilities 0.0%
C000225685 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2015 Portfolio
Class Name	R6 Class
Trading Symbol	AAALX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2015 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $23 0.22%
Expenses Paid, Amount	$ 23
Expense Ratio, Percent	0.22%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2015 Portfolio R6 Class returned 9.64% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 9.64% 2.60% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date 2015 9.56% 3.14% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927	$ 3,631,927
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 12,560
Investment Company, Portfolio Turnover	37%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 46.8% Domestic Equity Funds 29.6% International Fixed Income Funds 13.2% International Equity Funds 10.4% Other Assets and Liabilities 0.0%
C000225700 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2020 Portfolio
Class Name	Investor Class
Trading Symbol	AAAMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2020 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $60 0.57%
Expenses Paid, Amount	$ 60
Expense Ratio, Percent	0.57%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2020 Portfolio Investor Class returned 9.37% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 9.37% 2.44% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2020 9.37% 2.89% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 38,175
Investment Company, Portfolio Turnover	48%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 46.5% Domestic Equity Funds 29.6% International Fixed Income Funds 13.2% International Equity Funds 10.7% Other Assets and Liabilities 0.0%
C000225696 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2020 Portfolio
Class Name	I Class
Trading Symbol	AAAOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2020 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $39 0.37%
Expenses Paid, Amount	$ 39
Expense Ratio, Percent	0.37%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2020 Portfolio I Class returned 9.70% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 9.70% 2.64% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2020 9.37% 2.89% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 38,175
Investment Company, Portfolio Turnover	48%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 46.5% Domestic Equity Funds 29.6% International Fixed Income Funds 13.2% International Equity Funds 10.7% Other Assets and Liabilities 0.0%
C000225697 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2020 Portfolio
Class Name	A Class
Trading Symbol	AABEX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2020 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $86 0.82%
Expenses Paid, Amount	$ 86
Expense Ratio, Percent	0.82%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2020 Portfolio A Class returned 9.11% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 9.11% 2.16% 3/10/21 A Class - with sales charge 2.84% 0.40% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2020 9.37% 2.89% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 38,175
Investment Company, Portfolio Turnover	48%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 46.5% Domestic Equity Funds 29.6% International Fixed Income Funds 13.2% International Equity Funds 10.7% Other Assets and Liabilities 0.0%
C000225698 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2020 Portfolio
Class Name	R Class
Trading Symbol	AABGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2020 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $112 1.07%
Expenses Paid, Amount	$ 112
Expense Ratio, Percent	1.07%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2020 Portfolio R Class returned 8.85% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 8.85% 1.89% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2020 9.37% 2.89% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 38,175
Investment Company, Portfolio Turnover	48%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 46.5% Domestic Equity Funds 29.6% International Fixed Income Funds 13.2% International Equity Funds 10.7% Other Assets and Liabilities 0.0%
C000225699 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2020 Portfolio
Class Name	R6 Class
Trading Symbol	AABHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2020 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $23 0.22%
Expenses Paid, Amount	$ 23
Expense Ratio, Percent	0.22%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2020 Portfolio R6 Class returned 9.85% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 9.85% 2.79% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2020 9.37% 2.89% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508	$ 16,009,508
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 38,175
Investment Company, Portfolio Turnover	48%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 46.5% Domestic Equity Funds 29.6% International Fixed Income Funds 13.2% International Equity Funds 10.7% Other Assets and Liabilities 0.0%
C000225702 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2025 Portfolio
Class Name	Investor Class
Trading Symbol	AABJX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $60 0.57%
Expenses Paid, Amount	$ 60
Expense Ratio, Percent	0.57%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2025 Portfolio Investor Class returned 10.10% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 10.10% 2.61% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2025 10.01% 3.60% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 91,234
Investment Company, Portfolio Turnover	51%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 41.8% Domestic Equity Funds 32.9% International Equity Funds 12.7% International Fixed Income Funds 12.6% Other Assets and Liabilities 0.0%
C000225701 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2025 Portfolio
Class Name	I Class
Trading Symbol	AABKX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $39 0.37%
Expenses Paid, Amount	$ 39
Expense Ratio, Percent	0.37%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2025 Portfolio I Class returned 10.20% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 10.20% 2.78% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2025 10.01% 3.60% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 91,234
Investment Company, Portfolio Turnover	51%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 41.8% Domestic Equity Funds 32.9% International Equity Funds 12.7% International Fixed Income Funds 12.6% Other Assets and Liabilities 0.0%
C000225703 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2025 Portfolio
Class Name	A Class
Trading Symbol	AABQX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $86 0.82%
Expenses Paid, Amount	$ 86
Expense Ratio, Percent	0.82%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2025 Portfolio A Class returned 9.73% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 9.73% 2.34% 3/10/21 A Class - with sales charge 3.42% 0.57% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2025 10.01% 3.60% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 91,234
Investment Company, Portfolio Turnover	51%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 41.8% Domestic Equity Funds 32.9% International Equity Funds 12.7% International Fixed Income Funds 12.6% Other Assets and Liabilities 0.0%
C000225704 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2025 Portfolio
Class Name	R Class
Trading Symbol	AABRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $112 1.07%
Expenses Paid, Amount	$ 112
Expense Ratio, Percent	1.07%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2025 Portfolio R Class returned 9.47% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 9.47% 2.07% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2025 10.01% 3.60% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 91,234
Investment Company, Portfolio Turnover	51%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 41.8% Domestic Equity Funds 32.9% International Equity Funds 12.7% International Fixed Income Funds 12.6% Other Assets and Liabilities 0.0%
C000225705 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2025 Portfolio
Class Name	R6 Class
Trading Symbol	AABVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $23 0.22%
Expenses Paid, Amount	$ 23
Expense Ratio, Percent	0.22%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2025 Portfolio R6 Class returned 10.36% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 10.36% 2.94% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2025 10.01% 3.60% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594	$ 31,745,594
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 91,234
Investment Company, Portfolio Turnover	51%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 41.8% Domestic Equity Funds 32.9% International Equity Funds 12.7% International Fixed Income Funds 12.6% Other Assets and Liabilities 0.0%
C000225710 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2030 Portfolio
Class Name	Investor Class
Trading Symbol	AABWX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $61 0.58%
Expenses Paid, Amount	$ 61
Expense Ratio, Percent	0.58%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2030 Portfolio Investor Class returned 10.66% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 10.66% 2.94% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2030 11.36% 4.49% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011
Holdings Count | holding	24	24	24	24	24	24
Advisory Fees Paid, Amount	$ 122,206
Investment Company, Portfolio Turnover	28%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 37.2% Domestic Fixed Income Funds 36.0% International Equity Funds 15.2% International Fixed Income Funds 11.6% Other Assets and Liabilities 0.0%
C000225706 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2030 Portfolio
Class Name	I Class
Trading Symbol	AAEWX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $40 0.38%
Expenses Paid, Amount	$ 40
Expense Ratio, Percent	0.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2030 Portfolio I Class returned 10.87% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 10.87% 3.14% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2030 11.36% 4.49% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011
Holdings Count | holding	24	24	24	24	24	24
Advisory Fees Paid, Amount	$ 122,206
Investment Company, Portfolio Turnover	28%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 37.2% Domestic Fixed Income Funds 36.0% International Equity Funds 15.2% International Fixed Income Funds 11.6% Other Assets and Liabilities 0.0%
C000225707 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2030 Portfolio
Class Name	A Class
Trading Symbol	AABZX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $87 0.83%
Expenses Paid, Amount	$ 87
Expense Ratio, Percent	0.83%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2030 Portfolio A Class returned 10.39% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 10.39% 2.70% 3/10/21 A Class - with sales charge 4.04% 0.92% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2030 11.36% 4.49% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011
Holdings Count | holding	24	24	24	24	24	24
Advisory Fees Paid, Amount	$ 122,206
Investment Company, Portfolio Turnover	28%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 37.2% Domestic Fixed Income Funds 36.0% International Equity Funds 15.2% International Fixed Income Funds 11.6% Other Assets and Liabilities 0.0%
C000225708 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2030 Portfolio
Class Name	R Class
Trading Symbol	AACHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $114 1.08%
Expenses Paid, Amount	$ 114
Expense Ratio, Percent	1.08%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2030 Portfolio R Class returned 10.24% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 10.24% 2.45% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2030 11.36% 4.49% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011
Holdings Count | holding	24	24	24	24	24	24
Advisory Fees Paid, Amount	$ 122,206
Investment Company, Portfolio Turnover	28%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 37.2% Domestic Fixed Income Funds 36.0% International Equity Funds 15.2% International Fixed Income Funds 11.6% Other Assets and Liabilities 0.0%
C000225709 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2030 Portfolio
Class Name	R6 Class
Trading Symbol	AACJX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $24 0.23%
Expenses Paid, Amount	$ 24
Expense Ratio, Percent	0.23%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2030 Portfolio R6 Class returned 11.02% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 11.02% 3.30% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2030 11.36% 4.49% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011	$ 51,587,011
Holdings Count | holding	24	24	24	24	24	24
Advisory Fees Paid, Amount	$ 122,206
Investment Company, Portfolio Turnover	28%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 37.2% Domestic Fixed Income Funds 36.0% International Equity Funds 15.2% International Fixed Income Funds 11.6% Other Assets and Liabilities 0.0%
C000225715 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2035 Portfolio
Class Name	Investor Class
Trading Symbol	AACKX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $61 0.58%
Expenses Paid, Amount	$ 61
Expense Ratio, Percent	0.58%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2035 Portfolio Investor Class returned 11.58% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 11.58% 3.28% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2035 12.73% 5.42% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682
Holdings Count | holding	24	24	24	24	24	24
Advisory Fees Paid, Amount	$ 114,104
Investment Company, Portfolio Turnover	22%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.5% Domestic Fixed Income Funds 29.1% International Equity Funds 18.3% International Fixed Income Funds 10.1% Other Assets and Liabilities 0.0%
C000225714 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2035 Portfolio
Class Name	I Class
Trading Symbol	AACLX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $40 0.38%
Expenses Paid, Amount	$ 40
Expense Ratio, Percent	0.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2035 Portfolio I Class returned 11.79% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 11.79% 3.48% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2035 12.73% 5.42% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682
Holdings Count | holding	24	24	24	24	24	24
Advisory Fees Paid, Amount	$ 114,104
Investment Company, Portfolio Turnover	22%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.5% Domestic Fixed Income Funds 29.1% International Equity Funds 18.3% International Fixed Income Funds 10.1% Other Assets and Liabilities 0.0%
C000225713 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2035 Portfolio
Class Name	A Class
Trading Symbol	AACMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $88 0.83%
Expenses Paid, Amount	$ 88
Expense Ratio, Percent	0.83%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2035 Portfolio A Class returned 11.31% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 11.31% 3.03% 3/10/21 A Class - with sales charge 4.91% 1.25% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2035 12.73% 5.42% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682
Holdings Count | holding	24	24	24	24	24	24
Advisory Fees Paid, Amount	$ 114,104
Investment Company, Portfolio Turnover	22%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.5% Domestic Fixed Income Funds 29.1% International Equity Funds 18.3% International Fixed Income Funds 10.1% Other Assets and Liabilities 0.0%
C000225712 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2035 Portfolio
Class Name	R Class
Trading Symbol	AACPX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $114 1.08%
Expenses Paid, Amount	$ 114
Expense Ratio, Percent	1.08%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2035 Portfolio R Class returned 11.05% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 11.05% 2.76% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2035 12.73% 5.42% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682
Holdings Count | holding	24	24	24	24	24	24
Advisory Fees Paid, Amount	$ 114,104
Investment Company, Portfolio Turnover	22%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.5% Domestic Fixed Income Funds 29.1% International Equity Funds 18.3% International Fixed Income Funds 10.1% Other Assets and Liabilities 0.0%
C000225711 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2035 Portfolio
Class Name	R6 Class
Trading Symbol	AACQX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $24 0.23%
Expenses Paid, Amount	$ 24
Expense Ratio, Percent	0.23%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2035 Portfolio R6 Class returned 11.95% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 11.95% 3.64% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2035 12.73% 5.42% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682	$ 46,859,682
Holdings Count | holding	24	24	24	24	24	24
Advisory Fees Paid, Amount	$ 114,104
Investment Company, Portfolio Turnover	22%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.5% Domestic Fixed Income Funds 29.1% International Equity Funds 18.3% International Fixed Income Funds 10.1% Other Assets and Liabilities 0.0%
C000225716 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2040 Portfolio
Class Name	Investor Class
Trading Symbol	AACSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $62 0.58%
Expenses Paid, Amount	$ 62
Expense Ratio, Percent	0.58%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2040 Portfolio Investor Class returned 12.37% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 12.37% 3.77% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2040 13.85% 6.18% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 105,363
Investment Company, Portfolio Turnover	23%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.7% Domestic Fixed Income Funds 23.3% International Equity Funds 21.3% International Fixed Income Funds 8.7% Other Assets and Liabilities 0.0%
C000225717 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2040 Portfolio
Class Name	I Class
Trading Symbol	AACUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $40 0.38%
Expenses Paid, Amount	$ 40
Expense Ratio, Percent	0.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2040 Portfolio I Class returned 12.58% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 12.58% 3.97% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2040 13.85% 6.18% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 105,363
Investment Company, Portfolio Turnover	23%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.7% Domestic Fixed Income Funds 23.3% International Equity Funds 21.3% International Fixed Income Funds 8.7% Other Assets and Liabilities 0.0%
C000225718 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2040 Portfolio
Class Name	A Class
Trading Symbol	AACVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $88 0.83%
Expenses Paid, Amount	$ 88
Expense Ratio, Percent	0.83%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2040 Portfolio A Class returned 12.12% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 12.12% 3.49% 3/10/21 A Class - with sales charge 5.67% 1.70% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2040 13.85% 6.18% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 105,363
Investment Company, Portfolio Turnover	23%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.7% Domestic Fixed Income Funds 23.3% International Equity Funds 21.3% International Fixed Income Funds 8.7% Other Assets and Liabilities 0.0%
C000225720 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2040 Portfolio
Class Name	R Class
Trading Symbol	AACWX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $114 1.08%
Expenses Paid, Amount	$ 114
Expense Ratio, Percent	1.08%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2040 Portfolio R Class returned 11.85% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 11.85% 3.25% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2040 13.85% 6.18% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 105,363
Investment Company, Portfolio Turnover	23%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.7% Domestic Fixed Income Funds 23.3% International Equity Funds 21.3% International Fixed Income Funds 8.7% Other Assets and Liabilities 0.0%
C000225719 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2040 Portfolio
Class Name	R6 Class
Trading Symbol	AACZX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $24 0.23%
Expenses Paid, Amount	$ 24
Expense Ratio, Percent	0.23%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2040 Portfolio R6 Class returned 12.74% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 12.74% 4.13% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2040 13.85% 6.18% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256	$ 42,416,256
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 105,363
Investment Company, Portfolio Turnover	23%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.7% Domestic Fixed Income Funds 23.3% International Equity Funds 21.3% International Fixed Income Funds 8.7% Other Assets and Liabilities 0.0%
C000225721 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2045 Portfolio
Class Name	Investor Class
Trading Symbol	AADHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $62 0.58%
Expenses Paid, Amount	$ 62
Expense Ratio, Percent	0.58%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2045 Portfolio Investor Class returned 13.03% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 13.03% 4.29% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2045 14.73% 6.86% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 119,282
Investment Company, Portfolio Turnover	43%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 52.0% International Equity Funds 23.6% Domestic Fixed Income Funds 17.8% International Fixed Income Funds 6.6% Other Assets and Liabilities 0.0%
C000225722 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2045 Portfolio
Class Name	I Class
Trading Symbol	AADJX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $41 0.38%
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2045 Portfolio I Class returned 13.25% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 13.25% 4.49% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2045 14.73% 6.86% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 119,282
Investment Company, Portfolio Turnover	43%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 52.0% International Equity Funds 23.6% Domestic Fixed Income Funds 17.8% International Fixed Income Funds 6.6% Other Assets and Liabilities 0.0%
C000225723 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2045 Portfolio
Class Name	A Class
Trading Symbol	AADKX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $88 0.83%
Expenses Paid, Amount	$ 88
Expense Ratio, Percent	0.83%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2045 Portfolio A Class returned 12.78% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 12.78% 4.01% 3/10/21 A Class - with sales charge 6.29% 2.21% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2045 14.73% 6.86% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 119,282
Investment Company, Portfolio Turnover	43%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 52.0% International Equity Funds 23.6% Domestic Fixed Income Funds 17.8% International Fixed Income Funds 6.6% Other Assets and Liabilities 0.0%
C000225724 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2045 Portfolio
Class Name	R Class
Trading Symbol	AADLX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $115 1.08%
Expenses Paid, Amount	$ 115
Expense Ratio, Percent	1.08%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2045 Portfolio R Class returned 12.51% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 12.51% 3.77% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2045 14.73% 6.86% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 119,282
Investment Company, Portfolio Turnover	43%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 52.0% International Equity Funds 23.6% Domestic Fixed Income Funds 17.8% International Fixed Income Funds 6.6% Other Assets and Liabilities 0.0%
C000225725 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2045 Portfolio
Class Name	R6 Class
Trading Symbol	AADMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $25 0.23%
Expenses Paid, Amount	$ 25
Expense Ratio, Percent	0.23%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2045 Portfolio R6 Class returned 13.52% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 13.52% 4.65% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2045 14.73% 6.86% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533	$ 49,289,533
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 119,282
Investment Company, Portfolio Turnover	43%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 52.0% International Equity Funds 23.6% Domestic Fixed Income Funds 17.8% International Fixed Income Funds 6.6% Other Assets and Liabilities 0.0%
C000225726 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2050 Portfolio
Class Name	Investor Class
Trading Symbol	AADNX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $62 0.58%
Expenses Paid, Amount	$ 62
Expense Ratio, Percent	0.58%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2050 Portfolio Investor Class returned 13.86% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 13.86% 4.76% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2050 15.46% 7.23% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 93,555
Investment Company, Portfolio Turnover	18%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 56.7% International Equity Funds 25.7% Domestic Fixed Income Funds 12.8% International Fixed Income Funds 4.8% Other Assets and Liabilities 0.0%
C000225727 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2050 Portfolio
Class Name	I Class
Trading Symbol	AADOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $41 0.38%
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2050 Portfolio I Class returned 14.07% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 14.07% 4.97% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2050 15.46% 7.23% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 93,555
Investment Company, Portfolio Turnover	18%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 56.7% International Equity Funds 25.7% Domestic Fixed Income Funds 12.8% International Fixed Income Funds 4.8% Other Assets and Liabilities 0.0%
C000225728 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2050 Portfolio
Class Name	A Class
Trading Symbol	AADPX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $89 0.83%
Expenses Paid, Amount	$ 89
Expense Ratio, Percent	0.83%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2050 Portfolio A Class returned 13.48% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 13.48% 4.49% 3/10/21 A Class - with sales charge 6.96% 2.68% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2050 15.46% 7.23% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 93,555
Investment Company, Portfolio Turnover	18%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 56.7% International Equity Funds 25.7% Domestic Fixed Income Funds 12.8% International Fixed Income Funds 4.8% Other Assets and Liabilities 0.0%
C000225730 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2050 Portfolio
Class Name	R Class
Trading Symbol	AADQX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $115 1.08%
Expenses Paid, Amount	$ 115
Expense Ratio, Percent	1.08%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2050 Portfolio R Class returned 13.23% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 13.23% 4.22% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2050 15.46% 7.23% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 93,555
Investment Company, Portfolio Turnover	18%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 56.7% International Equity Funds 25.7% Domestic Fixed Income Funds 12.8% International Fixed Income Funds 4.8% Other Assets and Liabilities 0.0%
C000225729 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2050 Portfolio
Class Name	R6 Class
Trading Symbol	AADUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $25 0.23%
Expenses Paid, Amount	$ 25
Expense Ratio, Percent	0.23%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2050 Portfolio R6 Class returned 14.12% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 14.12% 5.10% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2050 15.46% 7.23% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260	$ 41,998,260
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 93,555
Investment Company, Portfolio Turnover	18%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 56.7% International Equity Funds 25.7% Domestic Fixed Income Funds 12.8% International Fixed Income Funds 4.8% Other Assets and Liabilities 0.0%
C000225735 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2055 Portfolio
Class Name	Investor Class
Trading Symbol	AADVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $62 0.58%
Expenses Paid, Amount	$ 62
Expense Ratio, Percent	0.58%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2055 Portfolio Investor Class returned 14.13% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 14.13% 4.99% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2055 15.41% 7.27% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 58,732
Investment Company, Portfolio Turnover	18%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 59.5% International Equity Funds 27.1% Domestic Fixed Income Funds 9.8% International Fixed Income Funds 3.6% Other Assets and Liabilities 0.0%
C000225731 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2055 Portfolio
Class Name	I Class
Trading Symbol	AADWX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $41 0.38%
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2055 Portfolio I Class returned 14.35% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 14.35% 5.19% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2055 15.41% 7.27% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 58,732
Investment Company, Portfolio Turnover	18%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 59.5% International Equity Funds 27.1% Domestic Fixed Income Funds 9.8% International Fixed Income Funds 3.6% Other Assets and Liabilities 0.0%
C000225732 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2055 Portfolio
Class Name	A Class
Trading Symbol	AADZX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $89 0.83%
Expenses Paid, Amount	$ 89
Expense Ratio, Percent	0.83%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2055 Portfolio A Class returned 13.86% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 13.86% 4.75% 3/10/21 A Class - with sales charge 7.32% 2.94% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2055 15.41% 7.27% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 58,732
Investment Company, Portfolio Turnover	18%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 59.5% International Equity Funds 27.1% Domestic Fixed Income Funds 9.8% International Fixed Income Funds 3.6% Other Assets and Liabilities 0.0%
C000225733 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2055 Portfolio
Class Name	R Class
Trading Symbol	AAEDX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $115 1.08%
Expenses Paid, Amount	$ 115
Expense Ratio, Percent	1.08%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2055 Portfolio R Class returned 13.61% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 13.61% 4.47% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2055 15.41% 7.27% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 58,732
Investment Company, Portfolio Turnover	18%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 59.5% International Equity Funds 27.1% Domestic Fixed Income Funds 9.8% International Fixed Income Funds 3.6% Other Assets and Liabilities 0.0%
C000225734 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2055 Portfolio
Class Name	R6 Class
Trading Symbol	AAEEX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $25 0.23%
Expenses Paid, Amount	$ 25
Expense Ratio, Percent	0.23%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2055 Portfolio R6 Class returned 14.49% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 14.49% 5.38% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2055 15.41% 7.27% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726	$ 26,889,726
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 58,732
Investment Company, Portfolio Turnover	18%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 59.5% International Equity Funds 27.1% Domestic Fixed Income Funds 9.8% International Fixed Income Funds 3.6% Other Assets and Liabilities 0.0%
C000225689 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2060 Portfolio
Class Name	Investor Class
Trading Symbol	AAEFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $62 0.58%
Expenses Paid, Amount	$ 62
Expense Ratio, Percent	0.58%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2060 Portfolio Investor Class returned 14.45% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 14.45% 5.19% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2060 15.45% 7.33% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 40,772
Investment Company, Portfolio Turnover	22%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 61.9% International Equity Funds 28.2% Domestic Fixed Income Funds 7.2% International Fixed Income Funds 2.7% Other Assets and Liabilities 0.0%
C000225686 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2060 Portfolio
Class Name	I Class
Trading Symbol	AAEGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $41 0.38%
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2060 Portfolio I Class returned 14.67% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 14.67% 5.36% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2060 15.45% 7.33% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 40,772
Investment Company, Portfolio Turnover	22%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 61.9% International Equity Funds 28.2% Domestic Fixed Income Funds 7.2% International Fixed Income Funds 2.7% Other Assets and Liabilities 0.0%
C000225687 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2060 Portfolio
Class Name	A Class
Trading Symbol	AAEHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $89 0.83%
Expenses Paid, Amount	$ 89
Expense Ratio, Percent	0.83%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2060 Portfolio A Class returned 14.30% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 14.30% 4.92% 3/10/21 A Class - with sales charge 7.73% 3.10% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2060 15.45% 7.33% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 40,772
Investment Company, Portfolio Turnover	22%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 61.9% International Equity Funds 28.2% Domestic Fixed Income Funds 7.2% International Fixed Income Funds 2.7% Other Assets and Liabilities 0.0%
C000225688 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2060 Portfolio
Class Name	R Class
Trading Symbol	AAEIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $116 1.08%
Expenses Paid, Amount	$ 116
Expense Ratio, Percent	1.08%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2060 Portfolio R Class returned 13.93% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 13.93% 4.64% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2060 15.45% 7.33% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 40,772
Investment Company, Portfolio Turnover	22%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 61.9% International Equity Funds 28.2% Domestic Fixed Income Funds 7.2% International Fixed Income Funds 2.7% Other Assets and Liabilities 0.0%
C000225690 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2060 Portfolio
Class Name	R6 Class
Trading Symbol	AAEJX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $25 0.23%
Expenses Paid, Amount	$ 25
Expense Ratio, Percent	0.23%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2060 Portfolio R6 Class returned 14.83% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 14.83% 5.52% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2060 15.45% 7.33% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817	$ 17,849,817
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 40,772
Investment Company, Portfolio Turnover	22%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 61.9% International Equity Funds 28.2% Domestic Fixed Income Funds 7.2% International Fixed Income Funds 2.7% Other Assets and Liabilities 0.0%
C000225692 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2065 Portfolio
Class Name	Investor Class
Trading Symbol	AAEKX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $62 0.58%
Expenses Paid, Amount	$ 62
Expense Ratio, Percent	0.58%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2065 Portfolio Investor Class returned 14.56% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 14.56% 5.37% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2065+ 15.84% 7.67% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 25,593
Investment Company, Portfolio Turnover	17%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 62.0% International Equity Funds 28.2% Domestic Fixed Income Funds 7.1% International Fixed Income Funds 2.7% Other Assets and Liabilities 0.0%
C000225693 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2065 Portfolio
Class Name	I Class
Trading Symbol	AAELX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $41 0.38%
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2065 Portfolio I Class returned 14.79% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 14.79% 5.55% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2065+ 15.84% 7.67% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 25,593
Investment Company, Portfolio Turnover	17%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 62.0% International Equity Funds 28.2% Domestic Fixed Income Funds 7.1% International Fixed Income Funds 2.7% Other Assets and Liabilities 0.0%
C000225695 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2065 Portfolio
Class Name	A Class
Trading Symbol	AAEOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $89 0.83%
Expenses Paid, Amount	$ 89
Expense Ratio, Percent	0.83%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2065 Portfolio A Class returned 14.20% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 14.20% 5.07% 3/10/21 A Class - with sales charge 7.63% 3.25% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2065+ 15.84% 7.67% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 25,593
Investment Company, Portfolio Turnover	17%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 62.0% International Equity Funds 28.2% Domestic Fixed Income Funds 7.1% International Fixed Income Funds 2.7% Other Assets and Liabilities 0.0%
C000225694 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2065 Portfolio
Class Name	R Class
Trading Symbol	AAEUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $116 1.08%
Expenses Paid, Amount	$ 116
Expense Ratio, Percent	1.08%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2065 Portfolio R Class returned 13.93% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 13.93% 4.82% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2065+ 15.84% 7.67% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 25,593
Investment Company, Portfolio Turnover	17%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 62.0% International Equity Funds 28.2% Domestic Fixed Income Funds 7.1% International Fixed Income Funds 2.7% Other Assets and Liabilities 0.0%
C000225691 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Blend+ 2065 Portfolio
Class Name	R6 Class
Trading Symbol	AAEVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Blend+ 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $25 0.23%
Expenses Paid, Amount	$ 25
Expense Ratio, Percent	0.23%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Blend+ 2065 Portfolio R6 Class returned 14.94% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 10, 2021, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 14.94% 5.71% 3/10/21 Regulatory Index Russell 3000 21.07% 10.68% — Bloomberg U.S. Aggregate 5.10% -1.65% — Performance Index S&P Target Date To 2065+ 15.84% 7.67% —
Performance Inception Date		Mar. 10, 2021
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853	$ 8,621,853
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 25,593
Investment Company, Portfolio Turnover	17%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 62.0% International Equity Funds 28.2% Domestic Fixed Income Funds 7.1% International Fixed Income Funds 2.7% Other Assets and Liabilities 0.0%
C000014670 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Portfolio: Very Conservative
Class Name	Investor Class
Trading Symbol	AONIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Portfolio: Very Conservative for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $0 0.00%
Expenses Paid, Amount	$ 0
Expense Ratio, Percent	0%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Portfolio: Very Conservative Investor Class returned 7.61% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 7.61% 3.64% 3.67% Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 389,438,383	$ 389,438,383	$ 389,438,383	$ 389,438,383	$ 389,438,383	$ 389,438,383
Holdings Count | holding	16	16	16	16	16	16
Advisory Fees Paid, Amount	$ 0
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 60.4% Domestic Equity Funds 23.2% International Fixed Income Funds 16.4% Other Assets and Liabilities 0.0%
C000153102 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Portfolio: Very Conservative
Class Name	R Class
Trading Symbol	AORHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Portfolio: Very Conservative for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $52 0.50%
Expenses Paid, Amount	$ 52
Expense Ratio, Percent	0.50%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Portfolio: Very Conservative R Class returned 7.07% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 20, 2015, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date R Class 7.07% 3.14% 3.08% 3/20/15 Russell 3000 21.07% 14.23% 12.20% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.32% —
Performance Inception Date						Mar. 20, 2015
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 389,438,383	$ 389,438,383	$ 389,438,383	$ 389,438,383	$ 389,438,383	$ 389,438,383
Holdings Count | holding	16	16	16	16	16	16
Advisory Fees Paid, Amount	$ 0
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 60.4% Domestic Equity Funds 23.2% International Fixed Income Funds 16.4% Other Assets and Liabilities 0.0%
C000014690 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Portfolio: Conservative
Class Name	Investor Class
Trading Symbol	AOCIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Portfolio: Conservative for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $0 0.00%
Expenses Paid, Amount	$ 0
Expense Ratio, Percent	0%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Portfolio: Conservative Investor Class returned 8.96% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 8.96% 5.24% 4.96% Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,116,411,646	$ 1,116,411,646	$ 1,116,411,646	$ 1,116,411,646	$ 1,116,411,646	$ 1,116,411,646
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 0
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 41.4% Domestic Equity Funds 32.5% International Fixed Income Funds 15.6% International Equity Funds 10.5% Other Assets and Liabilities 0.0%
C000153106 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Portfolio: Conservative
Class Name	R Class
Trading Symbol	AORSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Portfolio: Conservative for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $52 0.50%
Expenses Paid, Amount	$ 52
Expense Ratio, Percent	0.50%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Portfolio: Conservative R Class returned 8.50% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 20, 2015, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date R Class 8.50% 4.73% 4.24% 3/20/15 Russell 3000 21.07% 14.23% 12.20% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.32% —
Performance Inception Date						Mar. 20, 2015
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,116,411,646	$ 1,116,411,646	$ 1,116,411,646	$ 1,116,411,646	$ 1,116,411,646	$ 1,116,411,646
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 0
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 41.4% Domestic Equity Funds 32.5% International Fixed Income Funds 15.6% International Equity Funds 10.5% Other Assets and Liabilities 0.0%
C000014689 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Portfolio: Moderate
Class Name	Investor Class
Trading Symbol	AOMIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Portfolio: Moderate for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $0 0.00%
Expenses Paid, Amount	$ 0
Expense Ratio, Percent	0%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Portfolio: Moderate Investor Class returned 10.71% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 10.71% 6.93% 6.36% Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,820,325,153	$ 1,820,325,153	$ 1,820,325,153	$ 1,820,325,153	$ 1,820,325,153	$ 1,820,325,153
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 0
Investment Company, Portfolio Turnover	11%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 43.9% Domestic Fixed Income Funds 28.0% International Equity Funds 19.8% International Fixed Income Funds 8.3% Other Assets and Liabilities 0.0%
C000153105 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Portfolio: Moderate
Class Name	R Class
Trading Symbol	AORMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Portfolio: Moderate for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $53 0.50%
Expenses Paid, Amount	$ 53
Expense Ratio, Percent	0.50%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Portfolio: Moderate R Class returned 10.16% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 20, 2015, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date R Class 10.16% 6.41% 5.57% 3/20/15 Russell 3000 21.07% 14.23% 12.20% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.32% —
Performance Inception Date						Mar. 20, 2015
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,820,325,153	$ 1,820,325,153	$ 1,820,325,153	$ 1,820,325,153	$ 1,820,325,153	$ 1,820,325,153
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 0
Investment Company, Portfolio Turnover	11%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 43.9% Domestic Fixed Income Funds 28.0% International Equity Funds 19.8% International Fixed Income Funds 8.3% Other Assets and Liabilities 0.0%
C000014688 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Portfolio: Aggressive
Class Name	Investor Class
Trading Symbol	AOGIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Portfolio: Aggressive for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $0 0.00%
Expenses Paid, Amount	$ 0
Expense Ratio, Percent	0%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Portfolio: Aggressive Investor Class returned 12.11% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 12.11% 8.43% 7.62% Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 901,095,299	$ 901,095,299	$ 901,095,299	$ 901,095,299	$ 901,095,299	$ 901,095,299
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 0
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 54.8% International Equity Funds 23.8% Domestic Fixed Income Funds 16.9% International Fixed Income Funds 4.5% Other Assets and Liabilities 0.0%
C000153104 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Portfolio: Aggressive
Class Name	R Class
Trading Symbol	AORYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Portfolio: Aggressive for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $53 0.50%
Expenses Paid, Amount	$ 53
Expense Ratio, Percent	0.50%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Portfolio: Aggressive R Class returned 11.49% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 20, 2015, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date R Class 11.49% 7.90% 6.71% 3/20/15 Russell 3000 21.07% 14.23% 12.20% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.32% —
Performance Inception Date						Mar. 20, 2015
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 901,095,299	$ 901,095,299	$ 901,095,299	$ 901,095,299	$ 901,095,299	$ 901,095,299
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 0
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 54.8% International Equity Funds 23.8% Domestic Fixed Income Funds 16.9% International Fixed Income Funds 4.5% Other Assets and Liabilities 0.0%
C000014687 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Portfolio: Very Aggressive
Class Name	Investor Class
Trading Symbol	AOVIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Portfolio: Very Aggressive for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $0 0.00%
Expenses Paid, Amount	$ 0
Expense Ratio, Percent	0%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Portfolio: Very Aggressive Investor Class returned 13.63% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • Stock performance was highly bifurcated, with larger, growth-oriented stocks performing best, while smaller and value-oriented equities lagged. Amid economic uncertainty, investors sought the perceived relative safety of larger U.S. companies generating dependable profits. This helps explain why U.S. stock market performance is highly concentrated in a relative handful of securities. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 13.63% 9.78% 8.70% Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 353,221,910	$ 353,221,910	$ 353,221,910	$ 353,221,910	$ 353,221,910	$ 353,221,910
Holdings Count | holding	14	14	14	14	14	14
Advisory Fees Paid, Amount	$ 0
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 64.6% International Equity Funds 35.4% Other Assets and Liabilities 0.0%
C000153103 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice Portfolio: Very Aggressive
Class Name	R Class
Trading Symbol	AORVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice Portfolio: Very Aggressive for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $53 0.50%
Expenses Paid, Amount	$ 53
Expense Ratio, Percent	0.50%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice Portfolio: Very Aggressive R Class returned 13.08% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • Stock performance was highly bifurcated, with larger, growth-oriented stocks performing best, while smaller and value-oriented equities lagged. Amid economic uncertainty, investors sought the perceived relative safety of larger U.S. companies generating dependable profits. This helps explain why U.S. stock market performance is highly concentrated in a relative handful of securities. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) March 20, 2015, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date R Class 13.08% 9.24% 7.71% 3/20/15 Russell 3000 21.07% 14.23% 12.20% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.32% —
Performance Inception Date						Mar. 20, 2015
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 353,221,910	$ 353,221,910	$ 353,221,910	$ 353,221,910	$ 353,221,910	$ 353,221,910
Holdings Count | holding	14	14	14	14	14	14
Advisory Fees Paid, Amount	$ 0
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 64.6% International Equity Funds 35.4% Other Assets and Liabilities 0.0%
C000014683 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice In Retirement Portfolio
Class Name	Investor Class
Trading Symbol	ARTOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice In Retirement Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $78 0.74%
Expenses Paid, Amount	$ 78
Expense Ratio, Percent	0.74%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice In Retirement Portfolio Investor Class returned 9.50% for the reporting period ended July 31, 2024. One Choice In Retirement Portfolio seeks current income. Capital appreciation is a secondary objective. It is strategically exposed to a range of asset classes, as illustrated in the Fund Holdings. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 9.50% 5.13% 4.87% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date Retirement Income 8.98% 4.23% 4.21%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 11,277,073
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.6% Domestic Equity Funds 32.7% International Fixed Income Funds 14.7% International Equity Funds 12.0% Other Assets and Liabilities 0.0%
C000014685 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice In Retirement Portfolio
Class Name	I Class
Trading Symbol	ATTIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice In Retirement Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $57 0.54%
Expenses Paid, Amount	$ 57
Expense Ratio, Percent	0.54%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice In Retirement Portfolio I Class returned 9.72% for the reporting period ended July 31, 2024. One Choice In Retirement Portfolio seeks current income. Capital appreciation is a secondary objective. It is strategically exposed to a range of asset classes, as illustrated in the Fund Holdings. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year I Class 9.72% 5.32% 5.07% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date Retirement Income 8.98% 4.23% 4.21%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 11,277,073
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.6% Domestic Equity Funds 32.7% International Fixed Income Funds 14.7% International Equity Funds 12.0% Other Assets and Liabilities 0.0%
C000014684 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice In Retirement Portfolio
Class Name	A Class
Trading Symbol	ARTAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice In Retirement Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $104 0.99%
Expenses Paid, Amount	$ 104
Expense Ratio, Percent	0.99%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice In Retirement Portfolio A Class returned 9.23% for the reporting period ended July 31, 2024. One Choice In Retirement Portfolio seeks current income. Capital appreciation is a secondary objective. It is strategically exposed to a range of asset classes, as illustrated in the Fund Holdings. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year A Class 9.23% 4.85% 4.61% A Class - with sales charge 2.95% 3.61% 3.99% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date Retirement Income 8.98% 4.23% 4.21%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 11,277,073
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.6% Domestic Equity Funds 32.7% International Fixed Income Funds 14.7% International Equity Funds 12.0% Other Assets and Liabilities 0.0%
C000088020 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice In Retirement Portfolio
Class Name	C Class
Trading Symbol	ATTCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice In Retirement Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C Class $181 1.74%
Expenses Paid, Amount	$ 181
Expense Ratio, Percent	1.74%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice In Retirement Portfolio C Class returned 8.43% for the reporting period ended July 31, 2024. One Choice In Retirement Portfolio seeks current income. Capital appreciation is a secondary objective. It is strategically exposed to a range of asset classes, as illustrated in the Fund Holdings. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year C Class 8.43% 4.08% 3.83% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date Retirement Income 8.98% 4.23% 4.21%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 11,277,073
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.6% Domestic Equity Funds 32.7% International Fixed Income Funds 14.7% International Equity Funds 12.0% Other Assets and Liabilities 0.0%
C000014686 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice In Retirement Portfolio
Class Name	R Class
Trading Symbol	ARSRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice In Retirement Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $130 1.24%
Expenses Paid, Amount	$ 130
Expense Ratio, Percent	1.24%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice In Retirement Portfolio R Class returned 8.99% for the reporting period ended July 31, 2024. One Choice In Retirement Portfolio seeks current income. Capital appreciation is a secondary objective. It is strategically exposed to a range of asset classes, as illustrated in the Fund Holdings. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R Class 8.99% 4.59% 4.35% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date Retirement Income 8.98% 4.23% 4.21%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 11,277,073
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.6% Domestic Equity Funds 32.7% International Fixed Income Funds 14.7% International Equity Funds 12.0% Other Assets and Liabilities 0.0%
C000191058 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice In Retirement Portfolio
Class Name	R6 Class
Trading Symbol	ARDTX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice In Retirement Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $41 0.39%
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.39%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice In Retirement Portfolio R6 Class returned 9.92% for the reporting period ended July 31, 2024. One Choice In Retirement Portfolio seeks current income. Capital appreciation is a secondary objective. It is strategically exposed to a range of asset classes, as illustrated in the Fund Holdings. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R6 Class 9.92% 5.50% 5.23% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date Retirement Income 8.98% 4.23% 4.21%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615	$ 1,744,130,615
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 11,277,073
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.6% Domestic Equity Funds 32.7% International Fixed Income Funds 14.7% International Equity Funds 12.0% Other Assets and Liabilities 0.0%
C000014671 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2025 Portfolio
Class Name	Investor Class
Trading Symbol	ARWIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $80 0.76%
Expenses Paid, Amount	$ 80
Expense Ratio, Percent	0.76%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2025 Portfolio Investor Class returned 9.50% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 9.50% 5.34% 5.26% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2025 10.01% 5.88% 5.63%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 10,675,039
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.1% Domestic Equity Funds 33.0% International Fixed Income Funds 14.7% International Equity Funds 12.2% Other Assets and Liabilities 0.0%
C000014673 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2025 Portfolio
Class Name	I Class
Trading Symbol	ARWFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $59 0.56%
Expenses Paid, Amount	$ 59
Expense Ratio, Percent	0.56%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2025 Portfolio I Class returned 9.79% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year I Class 9.79% 5.55% 5.48% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2025 10.01% 5.88% 5.63%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 10,675,039
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.1% Domestic Equity Funds 33.0% International Fixed Income Funds 14.7% International Equity Funds 12.2% Other Assets and Liabilities 0.0%
C000014672 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2025 Portfolio
Class Name	A Class
Trading Symbol	ARWAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $106 1.01%
Expenses Paid, Amount	$ 106
Expense Ratio, Percent	1.01%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2025 Portfolio A Class returned 9.31% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year A Class 9.31% 5.09% 5.00% A Class - with sales charge 3.03% 3.85% 4.38% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2025 10.01% 5.88% 5.63%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 10,675,039
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.1% Domestic Equity Funds 33.0% International Fixed Income Funds 14.7% International Equity Funds 12.2% Other Assets and Liabilities 0.0%
C000088017 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2025 Portfolio
Class Name	C Class
Trading Symbol	ARWCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C Class $183 1.76%
Expenses Paid, Amount	$ 183
Expense Ratio, Percent	1.76%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2025 Portfolio C Class returned 8.42% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year C Class 8.42% 4.29% 4.21% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2025 10.01% 5.88% 5.63%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 10,675,039
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.1% Domestic Equity Funds 33.0% International Fixed Income Funds 14.7% International Equity Funds 12.2% Other Assets and Liabilities 0.0%
C000014674 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2025 Portfolio
Class Name	R Class
Trading Symbol	ARWRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $132 1.26%
Expenses Paid, Amount	$ 132
Expense Ratio, Percent	1.26%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2025 Portfolio R Class returned 9.05% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R Class 9.05% 4.83% 4.75% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2025 10.01% 5.88% 5.63%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 10,675,039
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.1% Domestic Equity Funds 33.0% International Fixed Income Funds 14.7% International Equity Funds 12.2% Other Assets and Liabilities 0.0%
C000191055 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2025 Portfolio
Class Name	R6 Class
Trading Symbol	ARWDX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2025 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $43 0.41%
Expenses Paid, Amount	$ 43
Expense Ratio, Percent	0.41%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2025 Portfolio R6 Class returned 9.98% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R6 Class 9.98% 5.72% 5.62% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2025 10.01% 5.88% 5.63%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543	$ 1,602,595,543
Holdings Count | holding	21	21	21	21	21	21
Advisory Fees Paid, Amount	$ 10,675,039
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Fixed Income Funds 40.1% Domestic Equity Funds 33.0% International Fixed Income Funds 14.7% International Equity Funds 12.2% Other Assets and Liabilities 0.0%
C000064316 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2030 Portfolio
Class Name	Investor Class
Trading Symbol	ARCVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $82 0.78%
Expenses Paid, Amount	$ 82
Expense Ratio, Percent	0.78%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2030 Portfolio Investor Class returned 9.88% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 9.88% 5.78% 5.68% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2030 11.36% 7.01% 6.41%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 10,685,483
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 36.0% Domestic Fixed Income Funds 35.4% International Fixed Income Funds 14.4% International Equity Funds 14.2% Other Assets and Liabilities 0.0%
C000064317 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2030 Portfolio
Class Name	I Class
Trading Symbol	ARCSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $61 0.58%
Expenses Paid, Amount	$ 61
Expense Ratio, Percent	0.58%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2030 Portfolio I Class returned 10.10% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year I Class 10.10% 6.00% 5.89% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2030 11.36% 7.01% 6.41%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 10,685,483
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 36.0% Domestic Fixed Income Funds 35.4% International Fixed Income Funds 14.4% International Equity Funds 14.2% Other Assets and Liabilities 0.0%
C000064318 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2030 Portfolio
Class Name	A Class
Trading Symbol	ARCMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $108 1.03%
Expenses Paid, Amount	$ 108
Expense Ratio, Percent	1.03%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2030 Portfolio A Class returned 9.63% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year A Class 9.63% 5.52% 5.41% A Class - with sales charge 3.33% 4.28% 4.79% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2030 11.36% 7.01% 6.41%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 10,685,483
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 36.0% Domestic Fixed Income Funds 35.4% International Fixed Income Funds 14.4% International Equity Funds 14.2% Other Assets and Liabilities 0.0%
C000088022 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2030 Portfolio
Class Name	C Class
Trading Symbol	ARWOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C Class $186 1.78%
Expenses Paid, Amount	$ 186
Expense Ratio, Percent	1.78%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2030 Portfolio C Class returned 8.81% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year C Class 8.81% 4.73% 4.63% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2030 11.36% 7.01% 6.41%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 10,685,483
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 36.0% Domestic Fixed Income Funds 35.4% International Fixed Income Funds 14.4% International Equity Funds 14.2% Other Assets and Liabilities 0.0%
C000064319 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2030 Portfolio
Class Name	R Class
Trading Symbol	ARCRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $134 1.28%
Expenses Paid, Amount	$ 134
Expense Ratio, Percent	1.28%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2030 Portfolio R Class returned 9.45% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R Class 9.45% 5.27% 5.16% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2030 11.36% 7.01% 6.41%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 10,685,483
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 36.0% Domestic Fixed Income Funds 35.4% International Fixed Income Funds 14.4% International Equity Funds 14.2% Other Assets and Liabilities 0.0%
C000191060 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2030 Portfolio
Class Name	R6 Class
Trading Symbol	ARCUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2030 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $45 0.43%
Expenses Paid, Amount	$ 45
Expense Ratio, Percent	0.43%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2030 Portfolio R6 Class returned 10.29% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R6 Class 10.29% 6.16% 6.04% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2030 11.36% 7.01% 6.41%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593	$ 1,683,861,593
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 10,685,483
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 36.0% Domestic Fixed Income Funds 35.4% International Fixed Income Funds 14.4% International Equity Funds 14.2% Other Assets and Liabilities 0.0%
C000014675 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2035 Portfolio
Class Name	Investor Class
Trading Symbol	ARYIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $85 0.81%
Expenses Paid, Amount	$ 85
Expense Ratio, Percent	0.81%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2035 Portfolio Investor Class returned 10.37% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 10.37% 6.29% 6.12% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2035 12.73% 8.10% 7.11%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 13,077,921
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 39.1% Domestic Fixed Income Funds 31.0% International Equity Funds 16.3% International Fixed Income Funds 13.6% Other Assets and Liabilities 0.0%
C000014677 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2035 Portfolio
Class Name	I Class
Trading Symbol	ARLIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $64 0.61%
Expenses Paid, Amount	$ 64
Expense Ratio, Percent	0.61%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2035 Portfolio I Class returned 10.50% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year I Class 10.50% 6.50% 6.33% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2035 12.73% 8.10% 7.11%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 13,077,921
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 39.1% Domestic Fixed Income Funds 31.0% International Equity Funds 16.3% International Fixed Income Funds 13.6% Other Assets and Liabilities 0.0%
C000014676 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2035 Portfolio
Class Name	A Class
Trading Symbol	ARYAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $111 1.06%
Expenses Paid, Amount	$ 111
Expense Ratio, Percent	1.06%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2035 Portfolio A Class returned 10.03% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year A Class 10.03% 6.01% 5.85% A Class - with sales charge 3.70% 4.76% 5.23% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2035 12.73% 8.10% 7.11%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 13,077,921
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 39.1% Domestic Fixed Income Funds 31.0% International Equity Funds 16.3% International Fixed Income Funds 13.6% Other Assets and Liabilities 0.0%
C000088018 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2035 Portfolio
Class Name	C Class
Trading Symbol	ARLCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C Class $189 1.81%
Expenses Paid, Amount	$ 189
Expense Ratio, Percent	1.81%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2035 Portfolio C Class returned 9.18% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year C Class 9.18% 5.22% 5.06% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2035 12.73% 8.10% 7.11%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 13,077,921
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 39.1% Domestic Fixed Income Funds 31.0% International Equity Funds 16.3% International Fixed Income Funds 13.6% Other Assets and Liabilities 0.0%
C000014678 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2035 Portfolio
Class Name	R Class
Trading Symbol	ARYRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $137 1.31%
Expenses Paid, Amount	$ 137
Expense Ratio, Percent	1.31%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2035 Portfolio R Class returned 9.76% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R Class 9.76% 5.75% 5.58% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2035 12.73% 8.10% 7.11%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 13,077,921
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 39.1% Domestic Fixed Income Funds 31.0% International Equity Funds 16.3% International Fixed Income Funds 13.6% Other Assets and Liabilities 0.0%
C000191056 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2035 Portfolio
Class Name	R6 Class
Trading Symbol	ARLDX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2035 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $48 0.46%
Expenses Paid, Amount	$ 48
Expense Ratio, Percent	0.46%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2035 Portfolio R6 Class returned 10.71% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R6 Class 10.71% 6.65% 6.48% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2035 12.73% 8.10% 7.11%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816	$ 1,931,547,816
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 13,077,921
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 39.1% Domestic Fixed Income Funds 31.0% International Equity Funds 16.3% International Fixed Income Funds 13.6% Other Assets and Liabilities 0.0%
C000064323 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2040 Portfolio
Class Name	Investor Class
Trading Symbol	ARDVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $87 0.83%
Expenses Paid, Amount	$ 87
Expense Ratio, Percent	0.83%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2040 Portfolio Investor Class returned 10.81% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 10.81% 6.81% 6.58% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2040 13.85% 8.89% 7.68%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 9,855,728
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.9% Domestic Fixed Income Funds 27.2% International Equity Funds 18.8% International Fixed Income Funds 11.1% Other Assets and Liabilities 0.0%
C000064320 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2040 Portfolio
Class Name	I Class
Trading Symbol	ARDSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $66 0.63%
Expenses Paid, Amount	$ 66
Expense Ratio, Percent	0.63%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2040 Portfolio I Class returned 11.02% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year I Class 11.02% 7.02% 6.79% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2040 13.85% 8.89% 7.68%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 9,855,728
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.9% Domestic Fixed Income Funds 27.2% International Equity Funds 18.8% International Fixed Income Funds 11.1% Other Assets and Liabilities 0.0%
C000064321 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2040 Portfolio
Class Name	A Class
Trading Symbol	ARDMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $114 1.08%
Expenses Paid, Amount	$ 114
Expense Ratio, Percent	1.08%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2040 Portfolio A Class returned 10.54% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year A Class 10.54% 6.54% 6.31% A Class - with sales charge 4.19% 5.29% 5.69% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2040 13.85% 8.89% 7.68%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 9,855,728
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.9% Domestic Fixed Income Funds 27.2% International Equity Funds 18.8% International Fixed Income Funds 11.1% Other Assets and Liabilities 0.0%
C000088023 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2040 Portfolio
Class Name	C Class
Trading Symbol	ARNOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C Class $192 1.83%
Expenses Paid, Amount	$ 192
Expense Ratio, Percent	1.83%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2040 Portfolio C Class returned 9.69% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year C Class 9.69% 5.73% 5.52% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2040 13.85% 8.89% 7.68%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 9,855,728
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.9% Domestic Fixed Income Funds 27.2% International Equity Funds 18.8% International Fixed Income Funds 11.1% Other Assets and Liabilities 0.0%
C000064322 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2040 Portfolio
Class Name	R Class
Trading Symbol	ARDRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $140 1.33%
Expenses Paid, Amount	$ 140
Expense Ratio, Percent	1.33%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2040 Portfolio R Class returned 10.28% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R Class 10.28% 6.28% 6.05% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2040 13.85% 8.89% 7.68%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 9,855,728
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.9% Domestic Fixed Income Funds 27.2% International Equity Funds 18.8% International Fixed Income Funds 11.1% Other Assets and Liabilities 0.0%
C000191061 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2040 Portfolio
Class Name	R6 Class
Trading Symbol	ARDUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2040 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $51 0.48%
Expenses Paid, Amount	$ 51
Expense Ratio, Percent	0.48%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2040 Portfolio R6 Class returned 11.19% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings rose by a smaller amount than U.S. large-cap stocks. The performance disparity can be explained by differences in actual and expected earnings growth—earnings by companies outside the U.S. fell at a faster rate in 2023 and are expected to recover more slowly in 2024 and 2025 than are those of U.S. companies, according to data provider FactSet. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R6 Class 11.19% 7.18% 6.94% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2040 13.85% 8.89% 7.68%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334	$ 1,459,444,334
Holdings Count | holding	22	22	22	22	22	22
Advisory Fees Paid, Amount	$ 9,855,728
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 42.9% Domestic Fixed Income Funds 27.2% International Equity Funds 18.8% International Fixed Income Funds 11.1% Other Assets and Liabilities 0.0%
C000014679 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2045 Portfolio
Class Name	Investor Class
Trading Symbol	AROIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $91 0.86%
Expenses Paid, Amount	$ 91
Expense Ratio, Percent	0.86%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2045 Portfolio Investor Class returned 11.35% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 11.35% 7.38% 7.05% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2045 14.73% 9.55% 8.10%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 11,019,328
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.8% Domestic Fixed Income Funds 23.3% International Equity Funds 21.1% International Fixed Income Funds 8.8% Other Assets and Liabilities 0.0%
C000014681 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2045 Portfolio
Class Name	I Class
Trading Symbol	AOOIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $70 0.66%
Expenses Paid, Amount	$ 70
Expense Ratio, Percent	0.66%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2045 Portfolio I Class returned 11.54% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year I Class 11.54% 7.60% 7.27% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2045 14.73% 9.55% 8.10%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 11,019,328
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.8% Domestic Fixed Income Funds 23.3% International Equity Funds 21.1% International Fixed Income Funds 8.8% Other Assets and Liabilities 0.0%
C000014680 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2045 Portfolio
Class Name	A Class
Trading Symbol	AROAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $117 1.11%
Expenses Paid, Amount	$ 117
Expense Ratio, Percent	1.11%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2045 Portfolio A Class returned 11.09% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year A Class 11.09% 7.12% 6.79% A Class - with sales charge 4.70% 5.86% 6.16% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2045 14.73% 9.55% 8.10%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 11,019,328
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.8% Domestic Fixed Income Funds 23.3% International Equity Funds 21.1% International Fixed Income Funds 8.8% Other Assets and Liabilities 0.0%
C000088019 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2045 Portfolio
Class Name	C Class
Trading Symbol	AROCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C Class $196 1.86%
Expenses Paid, Amount	$ 196
Expense Ratio, Percent	1.86%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2045 Portfolio C Class returned 10.26% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year C Class 10.26% 6.32% 5.99% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2045 14.73% 9.55% 8.10%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 11,019,328
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.8% Domestic Fixed Income Funds 23.3% International Equity Funds 21.1% International Fixed Income Funds 8.8% Other Assets and Liabilities 0.0%
C000014682 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2045 Portfolio
Class Name	R Class
Trading Symbol	ARORX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $143 1.36%
Expenses Paid, Amount	$ 143
Expense Ratio, Percent	1.36%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2045 Portfolio R Class returned 10.81% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R Class 10.81% 6.85% 6.53% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2045 14.73% 9.55% 8.10%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 11,019,328
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.8% Domestic Fixed Income Funds 23.3% International Equity Funds 21.1% International Fixed Income Funds 8.8% Other Assets and Liabilities 0.0%
C000191057 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2045 Portfolio
Class Name	R6 Class
Trading Symbol	ARDOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2045 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $54 0.51%
Expenses Paid, Amount	$ 54
Expense Ratio, Percent	0.51%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2045 Portfolio R6 Class returned 11.76% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R6 Class 11.76% 7.76% 7.43% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2045 14.73% 9.55% 8.10%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777	$ 1,568,549,777
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 11,019,328
Investment Company, Portfolio Turnover	13%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 46.8% Domestic Fixed Income Funds 23.3% International Equity Funds 21.1% International Fixed Income Funds 8.8% Other Assets and Liabilities 0.0%
C000064324 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2050 Portfolio
Class Name	Investor Class
Trading Symbol	ARFVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $93 0.88%
Expenses Paid, Amount	$ 93
Expense Ratio, Percent	0.88%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2050 Portfolio Investor Class returned 11.93% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 11.93% 8.06% 7.51% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2050 15.46% 10.00% 8.39%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 8,550,427
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 51.2% International Equity Funds 23.1% Domestic Fixed Income Funds 18.7% International Fixed Income Funds 7.0% Other Assets and Liabilities 0.0%
C000064325 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2050 Portfolio
Class Name	I Class
Trading Symbol	ARFSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $72 0.68%
Expenses Paid, Amount	$ 72
Expense Ratio, Percent	0.68%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2050 Portfolio I Class returned 12.05% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year I Class 12.05% 8.27% 7.72% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2050 15.46% 10.00% 8.39%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 8,550,427
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 51.2% International Equity Funds 23.1% Domestic Fixed Income Funds 18.7% International Fixed Income Funds 7.0% Other Assets and Liabilities 0.0%
C000064326 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2050 Portfolio
Class Name	A Class
Trading Symbol	ARFMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $120 1.13%
Expenses Paid, Amount	$ 120
Expense Ratio, Percent	1.13%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2050 Portfolio A Class returned 11.59% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year A Class 11.59% 7.79% 7.24% A Class - with sales charge 5.17% 6.52% 6.61% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2050 15.46% 10.00% 8.39%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 8,550,427
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 51.2% International Equity Funds 23.1% Domestic Fixed Income Funds 18.7% International Fixed Income Funds 7.0% Other Assets and Liabilities 0.0%
C000088024 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2050 Portfolio
Class Name	C Class
Trading Symbol	ARFDX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C Class $198 1.88%
Expenses Paid, Amount	$ 198
Expense Ratio, Percent	1.88%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2050 Portfolio C Class returned 10.74% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year C Class 10.74% 6.98% 6.44% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2050 15.46% 10.00% 8.39%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 8,550,427
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 51.2% International Equity Funds 23.1% Domestic Fixed Income Funds 18.7% International Fixed Income Funds 7.0% Other Assets and Liabilities 0.0%
C000064327 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2050 Portfolio
Class Name	R Class
Trading Symbol	ARFWX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $146 1.38%
Expenses Paid, Amount	$ 146
Expense Ratio, Percent	1.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2050 Portfolio R Class returned 11.31% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R Class 11.31% 7.52% 6.98% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2050 15.46% 10.00% 8.39%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 8,550,427
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 51.2% International Equity Funds 23.1% Domestic Fixed Income Funds 18.7% International Fixed Income Funds 7.0% Other Assets and Liabilities 0.0%
C000191062 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2050 Portfolio
Class Name	R6 Class
Trading Symbol	ARFEX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2050 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $56 0.53%
Expenses Paid, Amount	$ 56
Expense Ratio, Percent	0.53%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2050 Portfolio R6 Class returned 12.25% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R6 Class 12.25% 8.43% 7.87% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2050 15.46% 10.00% 8.39%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594	$ 1,220,127,594
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 8,550,427
Investment Company, Portfolio Turnover	14%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 51.2% International Equity Funds 23.1% Domestic Fixed Income Funds 18.7% International Fixed Income Funds 7.0% Other Assets and Liabilities 0.0%
C000098234 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2055 Portfolio
Class Name	Investor Class
Trading Symbol	AREVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $93 0.88%
Expenses Paid, Amount	$ 93
Expense Ratio, Percent	0.88%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2055 Portfolio Investor Class returned 12.36% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 12.36% 8.45% 7.77% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2055 15.41% 10.01% 8.44%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 6,051,252
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 55.3% International Equity Funds 24.9% Domestic Fixed Income Funds 14.4% International Fixed Income Funds 5.4% Other Assets and Liabilities 0.0%
C000098235 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2055 Portfolio
Class Name	I Class
Trading Symbol	ARENX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $72 0.68%
Expenses Paid, Amount	$ 72
Expense Ratio, Percent	0.68%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2055 Portfolio I Class returned 12.65% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year I Class 12.65% 8.67% 7.98% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2055 15.41% 10.01% 8.44%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 6,051,252
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 55.3% International Equity Funds 24.9% Domestic Fixed Income Funds 14.4% International Fixed Income Funds 5.4% Other Assets and Liabilities 0.0%
C000098236 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2055 Portfolio
Class Name	A Class
Trading Symbol	AREMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $120 1.13%
Expenses Paid, Amount	$ 120
Expense Ratio, Percent	1.13%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2055 Portfolio A Class returned 12.05% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year A Class 12.05% 8.17% 7.49% A Class - with sales charge 5.60% 6.89% 6.86% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2055 15.41% 10.01% 8.44%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 6,051,252
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 55.3% International Equity Funds 24.9% Domestic Fixed Income Funds 14.4% International Fixed Income Funds 5.4% Other Assets and Liabilities 0.0%
C000098237 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2055 Portfolio
Class Name	C Class
Trading Symbol	AREFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C Class $199 1.88%
Expenses Paid, Amount	$ 199
Expense Ratio, Percent	1.88%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2055 Portfolio C Class returned 11.27% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year C Class 11.27% 7.37% 6.69% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2055 15.41% 10.01% 8.44%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 6,051,252
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 55.3% International Equity Funds 24.9% Domestic Fixed Income Funds 14.4% International Fixed Income Funds 5.4% Other Assets and Liabilities 0.0%
C000098238 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2055 Portfolio
Class Name	R Class
Trading Symbol	AREOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $146 1.38%
Expenses Paid, Amount	$ 146
Expense Ratio, Percent	1.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2055 Portfolio R Class returned 11.83% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R Class 11.83% 7.92% 7.23% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2055 15.41% 10.01% 8.44%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 6,051,252
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 55.3% International Equity Funds 24.9% Domestic Fixed Income Funds 14.4% International Fixed Income Funds 5.4% Other Assets and Liabilities 0.0%
C000191063 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2055 Portfolio
Class Name	R6 Class
Trading Symbol	AREUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2055 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $56 0.53%
Expenses Paid, Amount	$ 56
Expense Ratio, Percent	0.53%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2055 Portfolio R6 Class returned 12.81% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R6 Class 12.81% 8.83% 8.13% Regulatory Index Russell 3000 21.07% 14.23% 12.58% Bloomberg U.S. Aggregate 5.10% 0.19% 1.61% Performance Index S&P Target Date To 2055 15.41% 10.01% 8.44%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534	$ 880,441,534
Holdings Count | holding	20	20	20	20	20	20
Advisory Fees Paid, Amount	$ 6,051,252
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 55.3% International Equity Funds 24.9% Domestic Fixed Income Funds 14.4% International Fixed Income Funds 5.4% Other Assets and Liabilities 0.0%
C000160243 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2060 Portfolio
Class Name	Investor Class
Trading Symbol	ARGVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $94 0.88%
Expenses Paid, Amount	$ 94
Expense Ratio, Percent	0.88%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2060 Portfolio Investor Class returned 12.62% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 30, 2015, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date Investor Class 12.62% 8.68% 9.16% 9/30/15 Regulatory Index Russell 3000 21.07% 14.23% 14.16% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.44% — Performance Index S&P Target Date To 2060 15.45% 10.24% 10.31% —
Performance Inception Date					Sep. 30, 2015
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 3,187,083
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 57.1% International Equity Funds 25.7% Domestic Fixed Income Funds 12.5% International Fixed Income Funds 4.7% Other Assets and Liabilities 0.0%
C000160244 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2060 Portfolio
Class Name	I Class
Trading Symbol	ARGNX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $72 0.68%
Expenses Paid, Amount	$ 72
Expense Ratio, Percent	0.68%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2060 Portfolio I Class returned 12.83% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 30, 2015, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date I Class 12.83% 8.89% 9.38% 9/30/15 Regulatory Index Russell 3000 21.07% 14.23% 14.16% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.44% — Performance Index S&P Target Date To 2060 15.45% 10.24% 10.31% —
Performance Inception Date					Sep. 30, 2015
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 3,187,083
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 57.1% International Equity Funds 25.7% Domestic Fixed Income Funds 12.5% International Fixed Income Funds 4.7% Other Assets and Liabilities 0.0%
C000160245 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2060 Portfolio
Class Name	A Class
Trading Symbol	ARGMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $120 1.13%
Expenses Paid, Amount	$ 120
Expense Ratio, Percent	1.13%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2060 Portfolio A Class returned 12.37% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 30, 2015, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date A Class 12.37% 8.40% 8.88% 9/30/15 A Class - with sales charge 5.91% 7.12% 8.16% 9/30/15 Regulatory Index Russell 3000 21.07% 14.23% 14.16% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.44% — Performance Index S&P Target Date To 2060 15.45% 10.24% 10.31% —
Performance Inception Date					Sep. 30, 2015
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 3,187,083
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 57.1% International Equity Funds 25.7% Domestic Fixed Income Funds 12.5% International Fixed Income Funds 4.7% Other Assets and Liabilities 0.0%
C000160246 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2060 Portfolio
Class Name	C Class
Trading Symbol	ARGHX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C Class $199 1.88%
Expenses Paid, Amount	$ 199
Expense Ratio, Percent	1.88%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2060 Portfolio C Class returned 11.52% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 30, 2015, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date C Class 11.52% 7.59% 8.08% 9/30/15 Regulatory Index Russell 3000 21.07% 14.23% 14.16% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.44% — Performance Index S&P Target Date To 2060 15.45% 10.24% 10.31% —
Performance Inception Date					Sep. 30, 2015
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 3,187,083
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 57.1% International Equity Funds 25.7% Domestic Fixed Income Funds 12.5% International Fixed Income Funds 4.7% Other Assets and Liabilities 0.0%
C000160247 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2060 Portfolio
Class Name	R Class
Trading Symbol	ARGRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $146 1.38%
Expenses Paid, Amount	$ 146
Expense Ratio, Percent	1.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2060 Portfolio R Class returned 12.10% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 30, 2015, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date R Class 12.10% 8.13% 8.62% 9/30/15 Regulatory Index Russell 3000 21.07% 14.23% 14.16% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.44% — Performance Index S&P Target Date To 2060 15.45% 10.24% 10.31% —
Performance Inception Date					Sep. 30, 2015
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 3,187,083
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 57.1% International Equity Funds 25.7% Domestic Fixed Income Funds 12.5% International Fixed Income Funds 4.7% Other Assets and Liabilities 0.0%
C000191064 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2060 Portfolio
Class Name	R6 Class
Trading Symbol	ARGDX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2060 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $56 0.53%
Expenses Paid, Amount	$ 56
Expense Ratio, Percent	0.53%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2060 Portfolio R6 Class returned 13.02% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 30, 2015, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date R6 Class 13.02% 9.05% 9.53% 10/23/17 Regulatory Index Russell 3000 21.07% 14.23% 14.16% — Bloomberg U.S. Aggregate 5.10% 0.19% 1.44% — Performance Index S&P Target Date To 2060 15.45% 10.24% 10.31% —
Performance Inception Date				Oct. 23, 2017
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598	$ 484,027,598
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 3,187,083
Investment Company, Portfolio Turnover	15%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 57.1% International Equity Funds 25.7% Domestic Fixed Income Funds 12.5% International Fixed Income Funds 4.7% Other Assets and Liabilities 0.0%
C000221889 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2065 Portfolio
Class Name	Investor Class
Trading Symbol	ARHVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $94 0.88%
Expenses Paid, Amount	$ 94
Expense Ratio, Percent	0.88%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2065 Portfolio Investor Class returned 12.90% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 23, 2020, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date Investor Class 12.90% 9.23% 9/23/20 Regulatory Index Russell 3000 21.07% 15.85% — Bloomberg U.S. Aggregate 5.10% -2.05% — Performance Index S&P Target Date To 2065+ 15.84% 12.50% —
Performance Inception Date			Sep. 23, 2020
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 515,740
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 58.7% International Equity Funds 26.3% Domestic Fixed Income Funds 10.9% International Fixed Income Funds 4.1% Other Assets and Liabilities 0.0%
C000221891 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2065 Portfolio
Class Name	I Class
Trading Symbol	ARHUX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $72 0.68%
Expenses Paid, Amount	$ 72
Expense Ratio, Percent	0.68%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2065 Portfolio I Class returned 13.11% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 23, 2020, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date I Class 13.11% 9.44% 9/23/20 Regulatory Index Russell 3000 21.07% 15.85% — Bloomberg U.S. Aggregate 5.10% -2.05% — Performance Index S&P Target Date To 2065+ 15.84% 12.50% —
Performance Inception Date			Sep. 23, 2020
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 515,740
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 58.7% International Equity Funds 26.3% Domestic Fixed Income Funds 10.9% International Fixed Income Funds 4.1% Other Assets and Liabilities 0.0%
C000221890 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2065 Portfolio
Class Name	A Class
Trading Symbol	ARHMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $120 1.13%
Expenses Paid, Amount	$ 120
Expense Ratio, Percent	1.13%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2065 Portfolio A Class returned 12.55% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 23, 2020, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date A Class 12.55% 8.93% 9/23/20 A Class - with sales charge 6.08% 7.27% 9/23/20 Regulatory Index Russell 3000 21.07% 15.85% — Bloomberg U.S. Aggregate 5.10% -2.05% — Performance Index S&P Target Date To 2065+ 15.84% 12.50% —
Performance Inception Date			Sep. 23, 2020
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 515,740
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 58.7% International Equity Funds 26.3% Domestic Fixed Income Funds 10.9% International Fixed Income Funds 4.1% Other Assets and Liabilities 0.0%
C000221892 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2065 Portfolio
Class Name	C Class
Trading Symbol	ARHEX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C Class $199 1.88%
Expenses Paid, Amount	$ 199
Expense Ratio, Percent	1.88%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2065 Portfolio C Class returned 11.66% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 23, 2020, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date C Class 11.66% 8.12% 9/23/20 Regulatory Index Russell 3000 21.07% 15.85% — Bloomberg U.S. Aggregate 5.10% -2.05% — Performance Index S&P Target Date To 2065+ 15.84% 12.50% —
Performance Inception Date			Sep. 23, 2020
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 515,740
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 58.7% International Equity Funds 26.3% Domestic Fixed Income Funds 10.9% International Fixed Income Funds 4.1% Other Assets and Liabilities 0.0%
C000221888 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2065 Portfolio
Class Name	R Class
Trading Symbol	ARHFX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $146 1.38%
Expenses Paid, Amount	$ 146
Expense Ratio, Percent	1.38%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2065 Portfolio R Class returned 12.28% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 23, 2020, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R Class 12.28% 8.68% 9/23/20 Regulatory Index Russell 3000 21.07% 15.85% — Bloomberg U.S. Aggregate 5.10% -2.05% — Performance Index S&P Target Date To 2065+ 15.84% 12.50% —
Performance Inception Date			Sep. 23, 2020
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 515,740
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 58.7% International Equity Funds 26.3% Domestic Fixed Income Funds 10.9% International Fixed Income Funds 4.1% Other Assets and Liabilities 0.0%
C000221887 [Member]
Shareholder Report [Line Items]
Fund Name	One Choice 2065 Portfolio
Class Name	R6 Class
Trading Symbol	ARHSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about One Choice 2065 Portfolio for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $57 0.53%
Expenses Paid, Amount	$ 57
Expense Ratio, Percent	0.53%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? One Choice 2065 Portfolio R6 Class returned 13.26% for the reporting period ended July 31, 2024. The fund seeks the highest total return consistent with its asset mix. The date in the fund name is the approximate year investors plan to retire, and the asset mix becomes more conservative as the target date approaches. See the Fund Holdings for the portfolio's asset weights. Below, we discuss the factors that affected these asset classes. • Investments in domestic equities contributed to performance. Despite inflation worries and high interest rates, U.S. stocks performed well as a much-anticipated recession failed to arrive. Investors favored stocks benefiting from heavy investment in artificial intelligence-related chips and technologies. Stocks gave back some gains in July, however, amid concerns about slowing economic conditions. • The portfolio's non-U.S. equity holdings also rose but by a smaller amount than U.S. large-cap stocks. Signs of slowing economic growth led the European Central Bank to lower short-term interest rates for the first time in almost five years in June 2024. Emerging markets equities generated positive results as Taiwanese and South Korean companies benefited from strength in technology stocks. • The portfolio's domestic fixed-income holdings contributed to performance. Bond yields were volatile amid changing perceptions of the economy and inflation. The benchmark 10-year Treasury yield started and ended the period at around 4% but went as high as 5% and as low as 3.8%. Reflecting the rally in stocks and strength in corporate earnings, corporate bonds performed well. • Non-U.S. fixed-income investments produced gains. Bond prices generally rose and yields fell as manufacturing activity in several developed economies slowed, while inflation concerns eased. That allowed the European Central Bank to cut interest rates. The Bank of Japan, however, raised rates to support its currency and fight imported inflation despite signs of economic weakness.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) September 23, 2020, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year Since Inception Inception Date R6 Class 13.26% 9.62% 9/23/20 Regulatory Index Russell 3000 21.07% 15.85% — Bloomberg U.S. Aggregate 5.10% -2.05% — Performance Index S&P Target Date To 2065+ 15.84% 12.50% —
Performance Inception Date			Sep. 23, 2020
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543	$ 95,449,543
Holdings Count | holding	19	19	19	19	19	19
Advisory Fees Paid, Amount	$ 515,740
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Domestic Equity Funds 58.7% International Equity Funds 26.3% Domestic Fixed Income Funds 10.9% International Fixed Income Funds 4.1% Other Assets and Liabilities 0.0%

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021	Mar. 10, 2021	Sep. 23, 2020	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016	Sep. 30, 2015	Jul. 31, 2015	Mar. 20, 2015	Jul. 31, 2014
C000225681 [Member]
Account Value [Line Items]
Account Value	$ 10,791	$ 9,876	$ 9,609	$ 10,510	$ 10,000
C000225682 [Member]
Account Value [Line Items]
Account Value	10,853	9,912	9,635	10,510	10,000
C000225683 [Member]
Account Value [Line Items]
Account Value	10,079	9,246	9,029	9,887	9,425
C000225684 [Member]
Account Value [Line Items]
Account Value	10,598	9,745	9,540	10,480	10,000
C000225685 [Member]
Account Value [Line Items]
Account Value	10,909	9,950	9,657	10,520	10,000
C000225700 [Member]
Account Value [Line Items]
Account Value	10,851	9,922	9,645	10,520	10,000
C000225696 [Member]
Account Value [Line Items]
Account Value	10,924	9,958	9,661	10,530	10,000
C000225697 [Member]
Account Value [Line Items]
Account Value	10,136	9,289	9,053	9,906	9,425
C000225698 [Member]
Account Value [Line Items]
Account Value	10,657	9,790	9,565	10,500	10,000
C000225699 [Member]
Account Value [Line Items]
Account Value	10,980	9,996	9,683	10,540	10,000
C000225702 [Member]
Account Value [Line Items]
Account Value	10,914	9,913	9,557	10,550	10,000
C000225701 [Member]
Account Value [Line Items]
Account Value	10,976	9,960	9,583	10,560	10,000
C000225703 [Member]
Account Value [Line Items]
Account Value	10,194	9,291	8,970	9,934	9,425
C000225704 [Member]
Account Value [Line Items]
Account Value	10,719	9,792	9,488	10,530	10,000
C000225705 [Member]
Account Value [Line Items]
Account Value	11,033	9,998	9,605	10,570	10,000
C000225710 [Member]
Account Value [Line Items]
Account Value	11,033	9,971	9,492	10,580	10,000
C000225706 [Member]
Account Value [Line Items]
Account Value	11,106	10,018	9,528	10,590	10,000
C000225707 [Member]
Account Value [Line Items]
Account Value	10,316	9,345	8,918	9,962	9,425
C000225708 [Member]
Account Value [Line Items]
Account Value	10,857	9,849	9,433	10,560	10,000
C000225709 [Member]
Account Value [Line Items]
Account Value	11,164	10,056	9,539	10,590	10,000
C000225715 [Member]
Account Value [Line Items]
Account Value	11,157	10,000	9,417	10,610	10,000
C000225714 [Member]
Account Value [Line Items]
Account Value	11,231	10,047	9,443	10,620	10,000
C000225713 [Member]
Account Value [Line Items]
Account Value	10,432	9,372	8,838	9,991	9,425
C000225712 [Member]
Account Value [Line Items]
Account Value	10,969	9,877	9,348	10,590	10,000
C000225711 [Member]
Account Value [Line Items]
Account Value	11,289	10,085	9,465	10,620	10,000
C000225716 [Member]
Account Value [Line Items]
Account Value	11,338	10,089	9,400	10,650	10,000
C000225717 [Member]
Account Value [Line Items]
Account Value	11,412	10,137	9,426	10,660	10,000
C000225718 [Member]
Account Value [Line Items]
Account Value	10,590	9,446	8,822	10,028	9,425
C000225720 [Member]
Account Value [Line Items]
Account Value	11,147	9,966	9,331	10,630	10,000
C000225719 [Member]
Account Value [Line Items]
Account Value	11,471	10,175	9,447	10,660	10,000
C000225721 [Member]
Account Value [Line Items]
Account Value	11,531	10,201	9,404	10,680	10,000
C000225722 [Member]
Account Value [Line Items]
Account Value	11,607	10,250	9,430	10,690	10,000
C000225723 [Member]
Account Value [Line Items]
Account Value	10,772	9,552	8,836	10,056	9,425
C000225724 [Member]
Account Value [Line Items]
Account Value	11,337	10,077	9,346	10,660	10,000
C000225725 [Member]
Account Value [Line Items]
Account Value	11,667	10,278	9,452	10,700	10,000
C000225726 [Member]
Account Value [Line Items]
Account Value	11,712	10,286	9,419	10,710	10,000
C000225727 [Member]
Account Value [Line Items]
Account Value	11,789	10,335	9,445	10,720	10,000
C000225728 [Member]
Account Value [Line Items]
Account Value	10,940	9,640	8,850	10,085	9,425
C000225730 [Member]
Account Value [Line Items]
Account Value	11,505	10,161	9,350	10,680	10,000
C000225729 [Member]
Account Value [Line Items]
Account Value	11,839	10,373	9,467	10,720	10,000
C000225735 [Member]
Account Value [Line Items]
Account Value	11,798	10,337	9,424	10,730	10,000
C000225731 [Member]
Account Value [Line Items]
Account Value	11,876	10,386	9,450	10,730	10,000
C000225732 [Member]
Account Value [Line Items]
Account Value	11,032	9,689	8,845	10,094	9,425
C000225733 [Member]
Account Value [Line Items]
Account Value	11,601	10,212	9,355	10,700	10,000
C000225734 [Member]
Account Value [Line Items]
Account Value	11,947	10,435	9,472	10,740	10,000
C000225689 [Member]
Account Value [Line Items]
Account Value	11,873	10,375	9,425	10,730	10,000
C000225686 [Member]
Account Value [Line Items]
Account Value	11,941	10,413	9,451	10,730	10,000
C000225687 [Member]
Account Value [Line Items]
Account Value	11,093	9,704	8,846	10,094	9,425
C000225688 [Member]
Account Value [Line Items]
Account Value	11,665	10,239	9,356	10,700	10,000
C000225690 [Member]
Account Value [Line Items]
Account Value	12,002	10,452	9,462	10,740	10,000
C000225692 [Member]
Account Value [Line Items]
Account Value	11,944	10,426	9,473	10,790	10,000
C000225693 [Member]
Account Value [Line Items]
Account Value	12,012	10,465	9,499	10,800	10,000
C000225695 [Member]
Account Value [Line Items]
Account Value	11,148	9,762	8,891	10,160	9,425
C000225694 [Member]
Account Value [Line Items]
Account Value	11,734	10,300	9,404	10,770	10,000
C000225691 [Member]
Account Value [Line Items]
Account Value	12,074	10,504	9,521	10,800	10,000
C000014670 [Member]
Account Value [Line Items]
Account Value	14,341	13,327	13,298	14,233			$ 12,778	$ 11,992	$ 11,388	$ 11,042	$ 10,710		$ 10,207		$ 10,000
C000153102 [Member]
Account Value [Line Items]
Account Value	13,287	12,410	12,446	13,377			12,080	11,385	10,874	10,598	10,322		9,887	$ 10,000
C000014690 [Member]
Account Value [Line Items]
Account Value	16,226	14,892	14,412	15,852			13,570	12,570	12,057	11,436	10,734		10,409		10,000
C000153106 [Member]
Account Value [Line Items]
Account Value	14,755	13,599	13,236	14,632			12,581	11,711	11,290	10,762	10,159		9,894	10,000
C000014689 [Member]
Account Value [Line Items]
Account Value	18,522	16,730	15,791	17,749			14,419	13,246	12,760	11,820	10,737		10,566		10,000
C000153105 [Member]
Account Value [Line Items]
Account Value	16,614	15,082	14,307	16,161			13,189	12,175	11,787	10,981	10,024		9,908	10,000
C000014688 [Member]
Account Value [Line Items]
Account Value	20,839	18,588	17,145	19,473			15,171	13,904	13,430	12,212	10,818		10,744		10,000
C000153104 [Member]
Account Value [Line Items]
Account Value	18,379	16,485	15,276	17,446			13,651	12,569	12,211	11,158	9,934		9,918	10,000
C000014687 [Member]
Account Value [Line Items]
Account Value	23,036	20,272	18,287	21,319			15,836	14,447	14,149	12,557	10,839		10,887		10,000
C000153103 [Member]
Account Value [Line Items]
Account Value	20,062	17,742	16,081	18,842			14,071	12,896	12,696	11,323	9,828		9,919	10,000
C000014683 [Member]
Account Value [Line Items]
Account Value	16,086	14,690	14,202	15,455			13,365	12,529	11,984	11,359	10,652		10,366		10,000
C000014685 [Member]
Account Value [Line Items]
Account Value	16,398	14,945	14,420	15,661			13,526	12,655	12,071	11,419	10,687		10,379		10,000
C000014684 [Member]
Account Value [Line Items]
Account Value	14,785	13,536	13,119	14,313			12,416	11,668	11,181	10,625	9,988		9,745		9,425
C000088020 [Member]
Account Value [Line Items]
Account Value	14,557	13,426	13,106	14,407			12,593	11,920	11,516	11,022	10,441		10,259		10,000
C000014686 [Member]
Account Value [Line Items]
Account Value	15,306	14,044	13,644	14,928			12,980	12,228	11,746	11,189	10,545		10,313		10,000
C000191058 [Member]
Account Value [Line Items]
Account Value	16,648	15,145	14,589	15,814			13,640	12,738	12,132	11,470	10,724		10,414		10,000
C000014671 [Member]
Account Value [Line Items]
Account Value	16,694	15,246	14,715	16,089			13,769	12,870	12,319	11,582	10,729		10,462		10,000
C000014673 [Member]
Account Value [Line Items]
Account Value	17,045	15,524	14,954	16,325			13,935	13,008	12,418	11,652	10,772		10,490		10,000
C000014672 [Member]
Account Value [Line Items]
Account Value	15,353	14,045	13,591	14,900			12,783	11,978	11,495	10,834	10,060		9,836		9,425
C000088017 [Member]
Account Value [Line Items]
Account Value	15,108	13,935	13,588	15,007			12,971	12,248	11,837	11,242	10,511		10,364		10,000
C000014674 [Member]
Account Value [Line Items]
Account Value	15,899	14,579	14,144	15,549			13,370	12,561	12,084	11,417	10,628		10,417		10,000
C000191055 [Member]
Account Value [Line Items]
Account Value	17,278	15,710	15,110	16,470			14,038	13,084	12,478	11,697	10,801		10,505		10,000
C000064316 [Member]
Account Value [Line Items]
Account Value	17,370	15,808	15,154	16,718			14,094	13,115	12,565	11,728	10,762		10,543		10,000
C000064317 [Member]
Account Value [Line Items]
Account Value	17,729	16,103	15,405	16,971			14,268	13,249	12,667	11,809	10,816		10,573		10,000
C000064318 [Member]
Account Value [Line Items]
Account Value	15,965	14,562	14,006	15,484			13,081	12,202	11,719	10,973	10,093		9,913		9,425
C000088022 [Member]
Account Value [Line Items]
Account Value	15,720	14,447	13,992	15,593			13,273	12,477	12,077	11,387	10,553		10,446		10,000
C000064319 [Member]
Account Value [Line Items]
Account Value	16,541	15,113	14,574	16,155			13,681	12,794	12,320	11,564	10,663		10,499		10,000
C000191060 [Member]
Account Value [Line Items]
Account Value	17,970	16,293	15,566	17,111			14,366	13,327	12,725	11,847	10,840		10,594		10,000
C000014675 [Member]
Account Value [Line Items]
Account Value	18,107	16,406	15,618	17,389			14,400	13,345	12,824	11,868	10,791		10,625		10,000
C000014677 [Member]
Account Value [Line Items]
Account Value	18,477	16,722	15,876	17,637			14,580	13,485	12,925	11,946	10,842		10,652		10,000
C000014676 [Member]
Account Value [Line Items]
Account Value	16,642	15,126	14,425	16,106			13,370	12,429	11,960	11,102	10,119		9,989		9,425
C000088018 [Member]
Account Value [Line Items]
Account Value	16,384	15,007	14,421	16,217			13,564	12,705	12,319	11,521	10,586		10,525		10,000
C000014678 [Member]
Account Value [Line Items]
Account Value	17,219	15,687	15,009	16,793			13,973	13,023	12,571	11,691	10,689		10,571		10,000
C000191056 [Member]
Account Value [Line Items]
Account Value	18,736	16,924	16,043	17,806			14,687	13,577	12,997	11,995	10,873		10,674		10,000
C000064323 [Member]
Account Value [Line Items]
Account Value	18,910	17,066	16,100	18,089			14,719	13,604	13,090	12,012	10,827		10,684		10,000
C000064320 [Member]
Account Value [Line Items]
Account Value	19,295	17,380	16,376	18,346			14,899	13,742	13,196	12,085	10,871		10,705		10,000
C000064321 [Member]
Account Value [Line Items]
Account Value	17,386	15,728	14,875	16,749			13,668	12,664	12,209	11,238	10,153		10,044		9,425
C000088023 [Member]
Account Value [Line Items]
Account Value	17,107	15,596	14,862	16,866			13,866	12,945	12,576	11,654	10,607		10,577		10,000
C000064322 [Member]
Account Value [Line Items]
Account Value	17,991	16,314	15,468	17,465			14,285	13,270	12,826	11,825	10,718		10,631		10,000
C000191061 [Member]
Account Value [Line Items]
Account Value	19,558	17,590	16,531	18,506			15,007	13,827	13,251	12,121	10,889		10,715		10,000
C000014679 [Member]
Account Value [Line Items]
Account Value	19,767	17,752	16,624	18,803			15,033	13,845	13,341	12,152	10,849		10,722		10,000
C000014681 [Member]
Account Value [Line Items]
Account Value	20,178	18,089	16,906	19,078			15,219	13,989	13,452	12,230	10,900		10,750		10,000
C000014680 [Member]
Account Value [Line Items]
Account Value	18,174	16,360	15,367	17,421			13,959	12,888	12,451	11,368	10,180		10,081		9,425
C000088019 [Member]
Account Value [Line Items]
Account Value	17,899	16,233	15,362	17,548			14,165	13,177	12,822	11,794	10,641		10,621		10,000
C000014682 [Member]
Account Value [Line Items]
Account Value	18,819	16,983	15,985	18,170			14,595	13,509	13,078	11,977	10,745		10,675		10,000
C000191057 [Member]
Account Value [Line Items]
Account Value	20,474	18,319	17,110	19,280			15,359	14,090	13,532	12,276	10,940		10,772		10,000
C000064324 [Member]
Account Value [Line Items]
Account Value	20,629	18,431	17,112	19,416			15,248	14,000	13,506	12,232	10,854		10,737		10,000
C000064325 [Member]
Account Value [Line Items]
Account Value	21,044	18,782	17,391	19,699			15,437	14,146	13,610	12,303	10,898		10,758		10,000
C000064326 [Member]
Account Value [Line Items]
Account Value	18,966	16,997	15,820	17,987			14,159	13,032	12,596	11,443	10,178		10,095		9,425
C000088024 [Member]
Account Value [Line Items]
Account Value	18,671	16,860	15,811	18,119			14,368	13,327	12,980	11,874	10,642		10,630		10,000
C000064327 [Member]
Account Value [Line Items]
Account Value	19,633	17,638	16,459	18,764			14,806	13,664	13,240	12,049	10,752		10,684		10,000
C000191062 [Member]
Account Value [Line Items]
Account Value	21,340	19,011	17,592	19,883			15,561	14,240	13,685	12,353	10,930		10,776		10,000
C000098234 [Member]
Account Value [Line Items]
Account Value	21,126	18,802	17,337	19,716			15,350	14,079	13,601	12,296	10,866		10,756		10,000
C000098235 [Member]
Account Value [Line Items]
Account Value	21,553	19,133	17,619	19,993			15,535	14,220	13,709	12,369	10,910		10,778		10,000
C000098236 [Member]
Account Value [Line Items]
Account Value	19,412	17,325	16,015	18,256			14,249	13,110	12,697	11,505	10,191		10,114		9,425
C000098237 [Member]
Account Value [Line Items]
Account Value	19,114	17,178	16,002	18,389			14,452	13,393	13,071	11,936	10,657		10,651		10,000
C000098238 [Member]
Account Value [Line Items]
Account Value	20,103	17,976	16,660	19,041			14,900	13,735	13,336	12,115	10,765		10,711		10,000
C000191063 [Member]
Account Value [Line Items]
Account Value	21,856	19,374	17,809	20,181			15,654	14,318	13,783	12,412	10,940		10,790		10,000
C000160243 [Member]
Account Value [Line Items]
Account Value	21,691	19,260	17,702	20,152			15,588	14,308	13,824	12,472	11,012	$ 10,000
C000160244 [Member]
Account Value [Line Items]
Account Value	22,076	19,566	17,948	20,386			15,731	14,423	13,908	12,524	11,027	10,000
C000160245 [Member]
Account Value [Line Items]
Account Value	19,987	17,787	16,401	18,711			14,503	13,356	12,937	11,699	10,353	9,425
C000160246 [Member]
Account Value [Line Items]
Account Value	19,860	17,809	16,538	19,008			14,854	13,776	13,443	12,243	10,923	10,000
C000160247 [Member]
Account Value [Line Items]
Account Value	20,758	18,517	17,104	19,569			15,211	14,042	13,636	12,354	10,967	10,000
C000191064 [Member]
Account Value [Line Items]
Account Value	22,339	19,763	18,106	20,537			15,827	14,482	13,945	12,531	11,039	10,000
C000221889 [Member]
Account Value [Line Items]
Account Value	14,054	12,449	11,421	13,002		$ 10,000
C000221891 [Member]
Account Value [Line Items]
Account Value	14,158	12,517	11,461	13,019		10,000
C000221890 [Member]
Account Value [Line Items]
Account Value	13,107	11,645	10,711	12,217		9,425
C000221892 [Member]
Account Value [Line Items]
Account Value	13,514	12,102	11,214	12,886		10,000
C000221888 [Member]
Account Value [Line Items]
Account Value	13,781	12,274	11,317	12,944		10,000
C000221887 [Member]
Account Value [Line Items]
Account Value	14,249	12,581	11,503	13,044		10,000
Russell 3000 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	14,112	11,655	10,347	11,168	10,000
Bloomberg U.S. Aggregate (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	9,450	8,992	9,305	10,238	10,000
Russell 3000 [Member]
Account Value [Line Items]
Account Value	32,705	27,013	23,979	25,882			18,657	16,819	15,711	13,498	11,623		11,128		10,000
Bloomberg U.S. Aggregate [Member]
Account Value [Line Items]
Account Value	11,727	11,158	11,547	12,705			12,795	11,619	10,750	10,837	10,893		10,282		10,000
Russell 3000 (Inception Date 3/20/2015) [Member]
Account Value [Line Items]
Account Value	29,414	24,294	21,566	23,277			16,779	15,126	14,130	12,140	10,453		10,008	10,000
Bloomberg U.S. Aggregate (Inception Date 3/20/2015) [Member]
Account Value [Line Items]
Account Value	11,304	10,756	11,131	12,247			12,334	11,200	10,363	10,446	10,500		9,912	$ 10,000
Russell 3000 (Inception Date 9/30/2015) [Member]
Account Value [Line Items]
Account Value	32,216	26,608	23,621	25,495			18,378	16,567	15,476	13,296	11,449	10,000
Bloomberg U.S. Aggregate (Inception Date 9/30/2015) [Member]
Account Value [Line Items]
Account Value	11,344	10,794	11,170	12,290			12,377	11,240	10,399	10,483	10,537	10,000
Russell 3000 (Inception Date 9/23/2020) [Member]
Account Value [Line Items]
Account Value	17,635	14,565	12,930	13,956		10,000
Bloomberg U.S. Aggregate (Inception Date 9/23/2020) [Member]
Account Value [Line Items]
Account Value	9,234	8,786	9,092	10,004		10,000
S&P Target Date 2015 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	11,107	10,138	9,732	10,494	10,000
S&P Target Date To 2020 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	11,015	10,071	9,727	10,460	10,000
S&P Target Date To 2025 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	11,276	10,249	9,746	10,532	10,000
S&P Target Date To 2030 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	11,607	10,423	9,771	10,600	10,000
S&P Target Date To 2035 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	11,962	10,610	9,805	10,674	10,000
S&P Target Date To 2040 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	12,259	10,767	9,816	10,710	10,000
S&P Target Date To 2045 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	12,526	10,918	9,829	10,755	10,000
S&P Target Date To 2050 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	12,673	10,976	9,826	10,764	10,000
S&P Target Date To 2055 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	12,690	10,995	9,835	10,779	10,000
S&P Target Date To 2060 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	12,714	11,013	9,832	10,777	10,000
S&P Target Date To 2065 (Inception Date 3/10/21) [Member]
Account Value [Line Items]
Account Value	12,852	11,094	9,903	10,788	$ 10,000
S&P Target Date Retirement Income [Member]
Account Value [Line Items]
Account Value	15,105	13,860	13,384	14,447			13,199	12,277	11,663	11,192	10,708		10,327		10,000
S&P Target Date To 2025 [Member]
Account Value [Line Items]
Account Value	17,299	15,724	14,952	16,159			13,904	13,000	12,440	11,687	10,741		10,417		10,000
S&P Target Date To 2030 [Member]
Account Value [Line Items]
Account Value	18,620	16,721	15,674	17,005			14,124	13,270	12,752	11,836	10,747		10,444		10,000
S&P Target Date To 2035 [Member]
Account Value [Line Items]
Account Value	19,868	17,624	16,286	17,729			14,254	13,460	12,993	11,932	10,728		10,464		10,000
S&P Target Date To 2040 [Member]
Account Value [Line Items]
Account Value	20,964	18,413	16,787	18,315			14,377	13,691	13,252	12,059	10,724		10,479		10,000
S&P Target Date To 2045 [Member]
Account Value [Line Items]
Account Value	21,788	18,991	17,098	18,708			14,420	13,812	13,379	12,130	10,716		10,491		10,000
S&P Target Date To 2050 [Member]
Account Value [Line Items]
Account Value	22,379	19,383	17,351	19,008			14,536	13,894	13,472	12,190	10,705		10,500		10,000
S&P Target Date To 2055 [Member]
Account Value [Line Items]
Account Value	22,481	19,479	17,424	19,095			14,529	13,954	13,552	12,233	10,695		$ 10,511		$ 10,000
S&P Target Date To 2060 (Inception Date 9/30/2015) [Member]
Account Value [Line Items]
Account Value	23,798	20,613	18,403	20,173			$ 15,323	$ 14,619	$ 14,182	$ 12,782	$ 11,123	$ 10,000
S&P Target Date To 2065 (Inception Date 9/23/2020) [Member]
Account Value [Line Items]
Account Value	$ 15,745	$ 13,592	$ 12,133	$ 13,217		$ 10,000

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)	12 Months Ended	41 Months Ended	46 Months Ended	60 Months Ended	81 Months Ended	106 Months Ended	112 Months Ended	120 Months Ended
	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024
C000225681 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.27%	2.27%
C000225682 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.49%	2.44%
C000225683 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	2.74%	0.23%
C000225684 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	8.75%	1.73%
C000225685 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.64%	2.60%
C000225700 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.37%	2.44%
C000225696 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.70%	2.64%
C000225697 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	2.84%	0.40%
C000225698 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	8.85%	1.89%
C000225699 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.85%	2.79%
C000225702 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.10%	2.61%
C000225701 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.20%	2.78%
C000225703 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	3.42%	0.57%
C000225704 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.47%	2.07%
C000225705 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.36%	2.94%
C000225710 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.66%	2.94%
C000225706 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.87%	3.14%
C000225707 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	4.04%	0.92%
C000225708 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.24%	2.45%
C000225709 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.02%	3.30%
C000225715 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.58%	3.28%
C000225714 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.79%	3.48%
C000225713 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	4.91%	1.25%
C000225712 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.05%	2.76%
C000225711 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.95%	3.64%
C000225716 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.37%	3.77%
C000225717 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.58%	3.97%
C000225718 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	5.67%	1.70%
C000225720 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.85%	3.25%
C000225719 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.74%	4.13%
C000225721 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.03%	4.29%
C000225722 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.25%	4.49%
C000225723 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	6.29%	2.21%
C000225724 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.51%	3.77%
C000225725 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.52%	4.65%
C000225726 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.86%	4.76%
C000225727 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.07%	4.97%
C000225728 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	6.96%	2.68%
C000225730 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.23%	4.22%
C000225729 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.12%	5.10%
C000225735 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.13%	4.99%
C000225731 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.35%	5.19%
C000225732 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	7.32%	2.94%
C000225733 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.61%	4.47%
C000225734 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.49%	5.38%
C000225689 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.45%	5.19%
C000225686 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.67%	5.36%
C000225687 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	7.73%	3.10%
C000225688 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.93%	4.64%
C000225690 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.83%	5.52%
C000225692 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.56%	5.37%
C000225693 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.79%	5.55%
C000225695 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	7.63%	3.25%
C000225694 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.93%	4.82%
C000225691 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.94%	5.71%
C000014670 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	7.61%			3.64%				3.67%
C000153102 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	7.07%			3.14%			3.08%
C000014690 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	8.96%			5.24%				4.96%
C000153106 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	8.50%			4.73%			4.24%
C000014689 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.71%			6.93%				6.36%
C000153105 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.16%			6.41%			5.57%
C000014688 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.11%			8.43%				7.62%
C000153104 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.49%			7.90%			6.71%
C000014687 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.63%			9.78%				8.70%
C000153103 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.08%			9.24%			7.71%
C000014683 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.50%			5.13%				4.87%
C000014685 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.72%			5.32%				5.07%
C000014684 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	2.95%			3.61%				3.99%
C000088020 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	8.43%			4.08%				3.83%
C000014686 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	8.99%			4.59%				4.35%
C000191058 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.92%			5.50%				5.23%
C000014671 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.50%			5.34%				5.26%
C000014673 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.79%			5.55%				5.48%
C000014672 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	3.03%			3.85%				4.38%
C000088017 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	8.42%			4.29%				4.21%
C000014674 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.05%			4.83%				4.75%
C000191055 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.98%			5.72%				5.62%
C000064316 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.88%			5.78%				5.68%
C000064317 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.10%			6%				5.89%
C000064318 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	3.33%			4.28%				4.79%
C000088022 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	8.81%			4.73%				4.63%
C000064319 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.45%			5.27%				5.16%
C000191060 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.29%			6.16%				6.04%
C000014675 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.37%			6.29%				6.12%
C000014677 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.50%			6.50%				6.33%
C000014676 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	3.70%			4.76%				5.23%
C000088018 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.18%			5.22%				5.06%
C000014678 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.76%			5.75%				5.58%
C000191056 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.71%			6.65%				6.48%
C000064323 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.81%			6.81%				6.58%
C000064320 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.02%			7.02%				6.79%
C000064321 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	4.19%			5.29%				5.69%
C000088023 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.69%			5.73%				5.52%
C000064322 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.28%			6.28%				6.05%
C000191061 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.19%			7.18%				6.94%
C000014679 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.35%			7.38%				7.05%
C000014681 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.54%			7.60%				7.27%
C000014680 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	4.70%			5.86%				6.16%
C000088019 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.26%			6.32%				5.99%
C000014682 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.81%			6.85%				6.53%
C000191057 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.76%			7.76%				7.43%
C000064324 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.93%			8.06%				7.51%
C000064325 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.05%			8.27%				7.72%
C000064326 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	5.17%			6.52%				6.61%
C000088024 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.74%			6.98%				6.44%
C000064327 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.31%			7.52%				6.98%
C000191062 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.25%			8.43%				7.87%
C000098234 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.36%			8.45%				7.77%
C000098235 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.65%			8.67%				7.98%
C000098236 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	5.60%			6.89%				6.86%
C000098237 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.27%			7.37%				6.69%
C000098238 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.83%			7.92%				7.23%
C000191063 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.81%			8.83%				8.13%
C000160243 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.62%			8.68%		9.16%
C000160244 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.83%			8.89%		9.38%
C000160245 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	5.91%			7.12%		8.16%
C000160246 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.52%			7.59%		8.08%
C000160247 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.10%			8.13%		8.62%
C000191064 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.02%			9.05%	9.53%
C000221889 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.90%		9.23%
C000221891 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.11%		9.44%
C000221890 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	6.08%		7.27%
C000221892 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.66%		8.12%
C000221888 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.28%		8.68%
C000221887 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.26%		9.62%
Without Sales Load [Member] | C000225683 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.01%	2%
Without Sales Load [Member] | C000225697 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.11%	2.16%
Without Sales Load [Member] | C000225703 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.73%	2.34%
Without Sales Load [Member] | C000225707 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.39%	2.70%
Without Sales Load [Member] | C000225713 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.31%	3.03%
Without Sales Load [Member] | C000225718 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.12%	3.49%
Without Sales Load [Member] | C000225723 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.78%	4.01%
Without Sales Load [Member] | C000225728 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.48%	4.49%
Without Sales Load [Member] | C000225732 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.86%	4.75%
Without Sales Load [Member] | C000225687 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.30%	4.92%
Without Sales Load [Member] | C000225695 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.20%	5.07%
Without Sales Load [Member] | C000014684 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.23%			4.85%				4.61%
Without Sales Load [Member] | C000014672 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.31%			5.09%				5%
Without Sales Load [Member] | C000064318 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.63%			5.52%				5.41%
Without Sales Load [Member] | C000014676 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.03%			6.01%				5.85%
Without Sales Load [Member] | C000064321 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.54%			6.54%				6.31%
Without Sales Load [Member] | C000014680 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.09%			7.12%				6.79%
Without Sales Load [Member] | C000064326 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.59%			7.79%				7.24%
Without Sales Load [Member] | C000098236 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.05%			8.17%				7.49%
Without Sales Load [Member] | C000160245 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.37%			8.40%		8.88%
Without Sales Load [Member] | C000221890 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.55%		8.93%
Russell 3000 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	21.07%	10.68%
Bloomberg U.S. Aggregate (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	5.10%	(1.65%)
Russell 3000 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	21.07%			14.23%				12.58%
Bloomberg U.S. Aggregate [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	5.10%			0.19%				1.61%
Russell 3000 (Inception Date 3/20/2015) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	21.07%			14.23%			12.20%
Bloomberg U.S. Aggregate (Inception Date 3/20/2015) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	5.10%			0.19%			1.32%
Russell 3000 (Inception Date 9/30/2015) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	21.07%			14.23%		14.16%
Bloomberg U.S. Aggregate (Inception Date 9/30/2015) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	5.10%			0.19%		1.44%
Russell 3000 (Inception Date 10/23/2017) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	21.07%			14.23%	14.16%
Bloomberg U.S. Aggregate (Inception Date 10/23/2017) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	5.10%			0.19%	1.44%
Russell 3000 (Inception Date 9/23/2020) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	21.07%		15.85%
Bloomberg U.S. Aggregate (Inception Date 9/23/2020) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	5.10%		(2.05%)
S&P Target Date 2015 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.56%	3.14%
S&P Target Date To 2020 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	9.37%	2.89%
S&P Target Date To 2025 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.01%	3.60%
S&P Target Date To 2030 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.36%	4.49%
S&P Target Date To 2035 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.73%	5.42%
S&P Target Date To 2040 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.85%	6.18%
S&P Target Date To 2045 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.73%	6.86%
S&P Target Date To 2050 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	15.46%	7.23%
S&P Target Date To 2055 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	15.41%	7.27%
S&P Target Date To 2060 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	15.45%	7.33%
S&P Target Date To 2065 (Inception Date 3/10/21) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	15.84%	7.67%
S&P Target Date Retirement Income [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	8.98%			4.23%				4.21%
S&P Target Date To 2025 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	10.01%			5.88%				5.63%
S&P Target Date To 2030 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	11.36%			7.01%				6.41%
S&P Target Date To 2035 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	12.73%			8.10%				7.11%
S&P Target Date To 2040 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	13.85%			8.89%				7.68%
S&P Target Date To 2045 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	14.73%			9.55%				8.10%
S&P Target Date To 2050 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	15.46%			10%				8.39%
S&P Target Date To 2055 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	15.41%			10.01%				8.44%
S&P Target Date To 2060 (Inception Date 9/30/2015) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	15.45%			10.24%		10.31%
S&P Target Date To 2060 (Inception Date 10/23/2017 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	15.45%			10.24%	10.31%
S&P Target Date To 2065 (Inception Date 9/23/2020) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	15.84%		12.50%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Jul. 31, 2024
C000225681 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000225681 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.60%
C000225681 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000225681 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.40%
C000225681 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225682 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000225682 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.60%
C000225682 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000225682 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.40%
C000225682 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225683 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000225683 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.60%
C000225683 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000225683 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.40%
C000225683 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225684 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000225684 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.60%
C000225684 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000225684 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.40%
C000225684 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225685 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000225685 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.60%
C000225685 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000225685 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.40%
C000225685 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225700 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.50%
C000225700 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.60%
C000225700 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000225700 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.70%
C000225700 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225696 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.50%
C000225696 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.60%
C000225696 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000225696 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.70%
C000225696 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225697 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.50%
C000225697 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.60%
C000225697 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000225697 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.70%
C000225697 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225698 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.50%
C000225698 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.60%
C000225698 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000225698 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.70%
C000225698 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225699 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.50%
C000225699 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.60%
C000225699 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.20%
C000225699 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.70%
C000225699 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225702 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.80%
C000225702 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.90%
C000225702 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.60%
C000225702 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.70%
C000225702 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225701 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.80%
C000225701 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.90%
C000225701 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.60%
C000225701 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.70%
C000225701 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225703 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.80%
C000225703 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.90%
C000225703 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.60%
C000225703 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.70%
C000225703 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225704 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.80%
C000225704 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.90%
C000225704 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.60%
C000225704 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.70%
C000225704 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225705 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.80%
C000225705 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.90%
C000225705 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.60%
C000225705 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.70%
C000225705 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225710 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000225710 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	37.20%
C000225710 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.60%
C000225710 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.20%
C000225710 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225706 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000225706 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	37.20%
C000225706 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.60%
C000225706 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.20%
C000225706 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225707 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000225707 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	37.20%
C000225707 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.60%
C000225707 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.20%
C000225707 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225708 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000225708 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	37.20%
C000225708 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.60%
C000225708 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.20%
C000225708 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225709 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000225709 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	37.20%
C000225709 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.60%
C000225709 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.20%
C000225709 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225715 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.10%
C000225715 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.50%
C000225715 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
C000225715 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.30%
C000225715 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225714 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.10%
C000225714 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.50%
C000225714 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
C000225714 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.30%
C000225714 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225713 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.10%
C000225713 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.50%
C000225713 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
C000225713 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.30%
C000225713 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225712 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.10%
C000225712 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.50%
C000225712 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
C000225712 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.30%
C000225712 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225711 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.10%
C000225711 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.50%
C000225711 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
C000225711 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.30%
C000225711 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225716 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000225716 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.70%
C000225716 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
C000225716 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.30%
C000225716 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225717 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000225717 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.70%
C000225717 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
C000225717 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.30%
C000225717 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225718 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000225718 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.70%
C000225718 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
C000225718 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.30%
C000225718 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225720 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000225720 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.70%
C000225720 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
C000225720 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.30%
C000225720 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225719 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000225719 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.70%
C000225719 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
C000225719 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.30%
C000225719 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225721 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
C000225721 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	52%
C000225721 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000225721 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.60%
C000225721 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225722 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
C000225722 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	52%
C000225722 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000225722 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.60%
C000225722 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225723 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
C000225723 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	52%
C000225723 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000225723 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.60%
C000225723 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225724 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
C000225724 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	52%
C000225724 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000225724 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.60%
C000225724 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225725 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
C000225725 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	52%
C000225725 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000225725 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.60%
C000225725 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225726 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000225726 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	56.70%
C000225726 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000225726 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000225726 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225727 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000225727 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	56.70%
C000225727 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000225727 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000225727 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225728 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000225728 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	56.70%
C000225728 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000225728 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000225728 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225730 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000225730 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	56.70%
C000225730 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000225730 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000225730 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225729 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
C000225729 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	56.70%
C000225729 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000225729 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000225729 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225735 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.80%
C000225735 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	59.50%
C000225735 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000225735 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.10%
C000225735 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225731 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.80%
C000225731 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	59.50%
C000225731 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000225731 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.10%
C000225731 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225732 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.80%
C000225732 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	59.50%
C000225732 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000225732 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.10%
C000225732 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225733 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.80%
C000225733 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	59.50%
C000225733 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000225733 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.10%
C000225733 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225734 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.80%
C000225734 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	59.50%
C000225734 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000225734 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.10%
C000225734 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225689 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000225689 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	61.90%
C000225689 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000225689 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.20%
C000225689 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225686 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000225686 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	61.90%
C000225686 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000225686 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.20%
C000225686 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225687 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000225687 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	61.90%
C000225687 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000225687 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.20%
C000225687 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225688 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000225688 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	61.90%
C000225688 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000225688 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.20%
C000225688 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225690 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
C000225690 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	61.90%
C000225690 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000225690 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.20%
C000225690 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225692 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.10%
C000225692 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	62%
C000225692 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000225692 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.20%
C000225692 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225693 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.10%
C000225693 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	62%
C000225693 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000225693 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.20%
C000225693 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225695 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.10%
C000225695 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	62%
C000225695 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000225695 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.20%
C000225695 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225694 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.10%
C000225694 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	62%
C000225694 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000225694 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.20%
C000225694 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000225691 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.10%
C000225691 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	62%
C000225691 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000225691 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28.20%
C000225691 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014670 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	60.40%
C000014670 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.20%
C000014670 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.40%
C000014670 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000153102 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	60.40%
C000153102 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.20%
C000153102 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.40%
C000153102 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014690 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.40%
C000014690 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.50%
C000014690 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.60%
C000014690 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.50%
C000014690 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000153106 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.40%
C000153106 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.50%
C000153106 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.60%
C000153106 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.50%
C000153106 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014689 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28%
C000014689 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	43.90%
C000014689 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.30%
C000014689 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.80%
C000014689 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000153105 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	28%
C000153105 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	43.90%
C000153105 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.30%
C000153105 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.80%
C000153105 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014688 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.90%
C000014688 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	54.80%
C000014688 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
C000014688 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.80%
C000014688 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000153104 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.90%
C000153104 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	54.80%
C000153104 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
C000153104 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.80%
C000153104 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014687 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	64.60%
C000014687 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	35.40%
C000014687 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000153103 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	64.60%
C000153103 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	35.40%
C000153103 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014683 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
C000014683 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.70%
C000014683 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000014683 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000014683 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014685 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
C000014685 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.70%
C000014685 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000014685 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000014685 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014684 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
C000014684 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.70%
C000014684 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000014684 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000014684 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000088020 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
C000088020 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.70%
C000088020 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000088020 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000088020 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014686 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
C000014686 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.70%
C000014686 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000014686 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000014686 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000191058 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
C000191058 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	32.70%
C000191058 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000191058 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000191058 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014671 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.10%
C000014671 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	33%
C000014671 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000014671 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000014671 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014673 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.10%
C000014673 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	33%
C000014673 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000014673 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000014673 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014672 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.10%
C000014672 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	33%
C000014672 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000014672 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000014672 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000088017 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.10%
C000088017 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	33%
C000088017 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000088017 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000088017 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014674 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.10%
C000014674 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	33%
C000014674 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000014674 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000014674 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000191055 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.10%
C000191055 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	33%
C000191055 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000191055 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000191055 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064316 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	35.40%
C000064316 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000064316 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000064316 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.20%
C000064316 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064317 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	35.40%
C000064317 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000064317 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000064317 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.20%
C000064317 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064318 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	35.40%
C000064318 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000064318 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000064318 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.20%
C000064318 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000088022 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	35.40%
C000088022 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000088022 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000088022 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.20%
C000088022 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064319 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	35.40%
C000064319 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000064319 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000064319 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.20%
C000064319 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000191060 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	35.40%
C000191060 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	36%
C000191060 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000191060 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.20%
C000191060 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014675 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	31%
C000014675 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.10%
C000014675 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.60%
C000014675 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.30%
C000014675 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014677 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	31%
C000014677 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.10%
C000014677 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.60%
C000014677 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.30%
C000014677 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014676 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	31%
C000014676 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.10%
C000014676 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.60%
C000014676 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.30%
C000014676 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000088018 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	31%
C000088018 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.10%
C000088018 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.60%
C000088018 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.30%
C000088018 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014678 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	31%
C000014678 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.10%
C000014678 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.60%
C000014678 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.30%
C000014678 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000191056 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	31%
C000191056 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	39.10%
C000191056 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.60%
C000191056 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.30%
C000191056 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064323 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.20%
C000064323 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.90%
C000064323 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
C000064323 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.80%
C000064323 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064320 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.20%
C000064320 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.90%
C000064320 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
C000064320 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.80%
C000064320 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064321 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.20%
C000064321 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.90%
C000064321 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
C000064321 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.80%
C000064321 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000088023 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.20%
C000088023 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.90%
C000088023 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
C000088023 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.80%
C000088023 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064322 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.20%
C000064322 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.90%
C000064322 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
C000064322 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.80%
C000064322 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000191061 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.20%
C000191061 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	42.90%
C000191061 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
C000191061 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.80%
C000191061 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014679 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000014679 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000014679 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.80%
C000014679 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
C000014679 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014681 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000014681 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000014681 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.80%
C000014681 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
C000014681 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014680 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000014680 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000014680 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.80%
C000014680 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
C000014680 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000088019 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000088019 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000088019 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.80%
C000088019 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
C000088019 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000014682 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000014682 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000014682 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.80%
C000014682 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
C000014682 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000191057 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.30%
C000191057 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	46.80%
C000191057 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.80%
C000191057 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
C000191057 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064324 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.70%
C000064324 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	51.20%
C000064324 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7%
C000064324 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.10%
C000064324 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064325 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.70%
C000064325 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	51.20%
C000064325 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7%
C000064325 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.10%
C000064325 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064326 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.70%
C000064326 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	51.20%
C000064326 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7%
C000064326 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.10%
C000064326 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000088024 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.70%
C000088024 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	51.20%
C000088024 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7%
C000088024 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.10%
C000088024 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000064327 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.70%
C000064327 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	51.20%
C000064327 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7%
C000064327 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.10%
C000064327 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000191062 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.70%
C000191062 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	51.20%
C000191062 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	7%
C000191062 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.10%
C000191062 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000098234 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000098234 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	55.30%
C000098234 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000098234 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.90%
C000098234 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000098235 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000098235 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	55.30%
C000098235 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000098235 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.90%
C000098235 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000098236 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000098236 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	55.30%
C000098236 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000098236 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.90%
C000098236 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000098237 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000098237 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	55.30%
C000098237 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000098237 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.90%
C000098237 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000098238 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000098238 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	55.30%
C000098238 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000098238 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.90%
C000098238 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000191063 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
C000191063 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	55.30%
C000191063 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000191063 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.90%
C000191063 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000160243 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.50%
C000160243 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	57.10%
C000160243 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000160243 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000160243 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000160244 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.50%
C000160244 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	57.10%
C000160244 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000160244 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000160244 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000160245 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.50%
C000160245 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	57.10%
C000160245 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000160245 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000160245 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000160246 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.50%
C000160246 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	57.10%
C000160246 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000160246 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000160246 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000160247 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.50%
C000160247 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	57.10%
C000160247 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000160247 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000160247 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000191064 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.50%
C000191064 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	57.10%
C000191064 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000191064 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%
C000191064 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000221889 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.90%
C000221889 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	58.70%
C000221889 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
C000221889 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.30%
C000221889 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000221891 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.90%
C000221891 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	58.70%
C000221891 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
C000221891 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.30%
C000221891 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000221890 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.90%
C000221890 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	58.70%
C000221890 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
C000221890 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.30%
C000221890 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000221892 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.90%
C000221892 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	58.70%
C000221892 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
C000221892 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.30%
C000221892 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000221888 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.90%
C000221888 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	58.70%
C000221888 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
C000221888 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.30%
C000221888 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%
C000221887 [Member] | Domestic Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.90%
C000221887 [Member] | Domestic Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	58.70%
C000221887 [Member] | International Fixed Income Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
C000221887 [Member] | International Equity Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.30%
C000221887 [Member] | Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	0%