| Form N-CSR Cover | 6 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | AMERICAN CENTURY INVESTMENT TRUST |
| Entity Central Index Key | 0000908406 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 6 Months Ended |
| Sep. 30, 2024 USD ($) holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | AMERICAN CENTURY INVESTMENT TRUST |
| Entity Central Index Key | 0000908406 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| C000039168 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Plus Fund |
| Class Name | Investor Class |
| Trading Symbol | ACCNX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Core Plus Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $28 0.55% |
| Expenses Paid, Amount | $ 28 |
| Expense Ratio, Percent | 0.55% |
| Net Assets | $ 407,794,618 |
| Holdings Count | holding | 590 |
| Advisory Fees Paid, Amount | $ 1,055,605 |
| Investment Company, Portfolio Turnover | 62% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 34.7% Corporate Bonds 33.8% Preferred Stocks 6.5% U.S. Treasury Securities 6.0% Collateralized Mortgage Obligations 5.1% Asset-Backed Securities 3.6% Commercial Mortgage-Backed Securities 3.3% Collateralized Loan Obligations 2.7% Municipal Securities 1.0% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.2% Other Assets and Liabilities (1.2)% |
| C000189691 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Plus Fund |
| Class Name | I Class |
| Trading Symbol | ACCTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Core Plus Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $23 0.45% |
| Expenses Paid, Amount | $ 23 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 407,794,618 |
| Holdings Count | holding | 590 |
| Advisory Fees Paid, Amount | $ 1,055,605 |
| Investment Company, Portfolio Turnover | 62% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 34.7% Corporate Bonds 33.8% Preferred Stocks 6.5% U.S. Treasury Securities 6.0% Collateralized Mortgage Obligations 5.1% Asset-Backed Securities 3.6% Commercial Mortgage-Backed Securities 3.3% Collateralized Loan Obligations 2.7% Municipal Securities 1.0% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.2% Other Assets and Liabilities (1.2)% |
| C000039170 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Plus Fund |
| Class Name | A Class |
| Trading Symbol | ACCQX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Core Plus Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $41 0.80% |
| Expenses Paid, Amount | $ 41 |
| Expense Ratio, Percent | 0.80% |
| Net Assets | $ 407,794,618 |
| Holdings Count | holding | 590 |
| Advisory Fees Paid, Amount | $ 1,055,605 |
| Investment Company, Portfolio Turnover | 62% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 34.7% Corporate Bonds 33.8% Preferred Stocks 6.5% U.S. Treasury Securities 6.0% Collateralized Mortgage Obligations 5.1% Asset-Backed Securities 3.6% Commercial Mortgage-Backed Securities 3.3% Collateralized Loan Obligations 2.7% Municipal Securities 1.0% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.2% Other Assets and Liabilities (1.2)% |
| C000039172 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Plus Fund |
| Class Name | C Class |
| Trading Symbol | ACCKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Core Plus Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $80 1.55% |
| Expenses Paid, Amount | $ 80 |
| Expense Ratio, Percent | 1.55% |
| Net Assets | $ 407,794,618 |
| Holdings Count | holding | 590 |
| Advisory Fees Paid, Amount | $ 1,055,605 |
| Investment Company, Portfolio Turnover | 62% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 34.7% Corporate Bonds 33.8% Preferred Stocks 6.5% U.S. Treasury Securities 6.0% Collateralized Mortgage Obligations 5.1% Asset-Backed Securities 3.6% Commercial Mortgage-Backed Securities 3.3% Collateralized Loan Obligations 2.7% Municipal Securities 1.0% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.2% Other Assets and Liabilities (1.2)% |
| C000039173 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Plus Fund |
| Class Name | R Class |
| Trading Symbol | ACCPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Core Plus Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $54 1.05% |
| Expenses Paid, Amount | $ 54 |
| Expense Ratio, Percent | 1.05% |
| Net Assets | $ 407,794,618 |
| Holdings Count | holding | 590 |
| Advisory Fees Paid, Amount | $ 1,055,605 |
| Investment Company, Portfolio Turnover | 62% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 34.7% Corporate Bonds 33.8% Preferred Stocks 6.5% U.S. Treasury Securities 6.0% Collateralized Mortgage Obligations 5.1% Asset-Backed Securities 3.6% Commercial Mortgage-Backed Securities 3.3% Collateralized Loan Obligations 2.7% Municipal Securities 1.0% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.2% Other Assets and Liabilities (1.2)% |
| C000039169 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Plus Fund |
| Class Name | R5 Class |
| Trading Symbol | ACCUX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Core Plus Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R5 Class $18 0.35% |
| Expenses Paid, Amount | $ 18 |
| Expense Ratio, Percent | 0.35% |
| Net Assets | $ 407,794,618 |
| Holdings Count | holding | 590 |
| Advisory Fees Paid, Amount | $ 1,055,605 |
| Investment Company, Portfolio Turnover | 62% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 34.7% Corporate Bonds 33.8% Preferred Stocks 6.5% U.S. Treasury Securities 6.0% Collateralized Mortgage Obligations 5.1% Asset-Backed Securities 3.6% Commercial Mortgage-Backed Securities 3.3% Collateralized Loan Obligations 2.7% Municipal Securities 1.0% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.2% Other Assets and Liabilities (1.2)% |
| C000222299 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Core Plus Fund |
| Class Name | G Class |
| Trading Symbol | ACCYX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Core Plus Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment G Class $1 0.01% |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.01% |
| Net Assets | $ 407,794,618 |
| Holdings Count | holding | 590 |
| Advisory Fees Paid, Amount | $ 1,055,605 |
| Investment Company, Portfolio Turnover | 62% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 34.7% Corporate Bonds 33.8% Preferred Stocks 6.5% U.S. Treasury Securities 6.0% Collateralized Mortgage Obligations 5.1% Asset-Backed Securities 3.6% Commercial Mortgage-Backed Securities 3.3% Collateralized Loan Obligations 2.7% Municipal Securities 1.0% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.2% Other Assets and Liabilities (1.2)% |
| C000017955 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Bond Fund |
| Class Name | Investor Class |
| Trading Symbol | ADFIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diversified Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $31 0.60% |
| Expenses Paid, Amount | $ 31 |
| Expense Ratio, Percent | 0.60% |
| Net Assets | $ 6,201,262,197 |
| Holdings Count | holding | 577 |
| Advisory Fees Paid, Amount | $ 3,861,188 |
| Investment Company, Portfolio Turnover | 81% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 35.3% Corporate Bonds 21.7% U.S. Treasury Securities 21.3% Collateralized Mortgage Obligations 5.0% Asset-Backed Securities 4.8% Collateralized Loan Obligations 3.7% Commercial Mortgage-Backed Securities 2.0% Preferred Stocks 1.5% Municipal Securities 0.8% U.S. Government Agency Securities 0.8% Sovereign Governments and Agencies 0.2% Short-Term Investments 4.1% Other Assets and Liabilities (1.2)% |
| C000017957 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Bond Fund |
| Class Name | I Class |
| Trading Symbol | ACBPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diversified Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $21 0.40% |
| Expenses Paid, Amount | $ 21 |
| Expense Ratio, Percent | 0.40% |
| Net Assets | $ 6,201,262,197 |
| Holdings Count | holding | 577 |
| Advisory Fees Paid, Amount | $ 3,861,188 |
| Investment Company, Portfolio Turnover | 81% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 35.3% Corporate Bonds 21.7% U.S. Treasury Securities 21.3% Collateralized Mortgage Obligations 5.0% Asset-Backed Securities 4.8% Collateralized Loan Obligations 3.7% Commercial Mortgage-Backed Securities 2.0% Preferred Stocks 1.5% Municipal Securities 0.8% U.S. Government Agency Securities 0.8% Sovereign Governments and Agencies 0.2% Short-Term Investments 4.1% Other Assets and Liabilities (1.2)% |
| C000189684 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Bond Fund |
| Class Name | Y Class |
| Trading Symbol | ADVYX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diversified Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Y Class $19 0.37% |
| Expenses Paid, Amount | $ 19 |
| Expense Ratio, Percent | 0.37% |
| Net Assets | $ 6,201,262,197 |
| Holdings Count | holding | 577 |
| Advisory Fees Paid, Amount | $ 3,861,188 |
| Investment Company, Portfolio Turnover | 81% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 35.3% Corporate Bonds 21.7% U.S. Treasury Securities 21.3% Collateralized Mortgage Obligations 5.0% Asset-Backed Securities 4.8% Collateralized Loan Obligations 3.7% Commercial Mortgage-Backed Securities 2.0% Preferred Stocks 1.5% Municipal Securities 0.8% U.S. Government Agency Securities 0.8% Sovereign Governments and Agencies 0.2% Short-Term Investments 4.1% Other Assets and Liabilities (1.2)% |
| C000017956 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Bond Fund |
| Class Name | A Class |
| Trading Symbol | ADFAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diversified Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $44 0.85% |
| Expenses Paid, Amount | $ 44 |
| Expense Ratio, Percent | 0.85% |
| Net Assets | $ 6,201,262,197 |
| Holdings Count | holding | 577 |
| Advisory Fees Paid, Amount | $ 3,861,188 |
| Investment Company, Portfolio Turnover | 81% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 35.3% Corporate Bonds 21.7% U.S. Treasury Securities 21.3% Collateralized Mortgage Obligations 5.0% Asset-Backed Securities 4.8% Collateralized Loan Obligations 3.7% Commercial Mortgage-Backed Securities 2.0% Preferred Stocks 1.5% Municipal Securities 0.8% U.S. Government Agency Securities 0.8% Sovereign Governments and Agencies 0.2% Short-Term Investments 4.1% Other Assets and Liabilities (1.2)% |
| C000017960 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Bond Fund |
| Class Name | C Class |
| Trading Symbol | CDBCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diversified Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $82 1.60% |
| Expenses Paid, Amount | $ 82 |
| Expense Ratio, Percent | 1.60% |
| Net Assets | $ 6,201,262,197 |
| Holdings Count | holding | 577 |
| Advisory Fees Paid, Amount | $ 3,861,188 |
| Investment Company, Portfolio Turnover | 81% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 35.3% Corporate Bonds 21.7% U.S. Treasury Securities 21.3% Collateralized Mortgage Obligations 5.0% Asset-Backed Securities 4.8% Collateralized Loan Obligations 3.7% Commercial Mortgage-Backed Securities 2.0% Preferred Stocks 1.5% Municipal Securities 0.8% U.S. Government Agency Securities 0.8% Sovereign Governments and Agencies 0.2% Short-Term Investments 4.1% Other Assets and Liabilities (1.2)% |
| C000017961 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Bond Fund |
| Class Name | R Class |
| Trading Symbol | ADVRX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diversified Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $57 1.10% |
| Expenses Paid, Amount | $ 57 |
| Expense Ratio, Percent | 1.10% |
| Net Assets | $ 6,201,262,197 |
| Holdings Count | holding | 577 |
| Advisory Fees Paid, Amount | $ 3,861,188 |
| Investment Company, Portfolio Turnover | 81% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 35.3% Corporate Bonds 21.7% U.S. Treasury Securities 21.3% Collateralized Mortgage Obligations 5.0% Asset-Backed Securities 4.8% Collateralized Loan Obligations 3.7% Commercial Mortgage-Backed Securities 2.0% Preferred Stocks 1.5% Municipal Securities 0.8% U.S. Government Agency Securities 0.8% Sovereign Governments and Agencies 0.2% Short-Term Investments 4.1% Other Assets and Liabilities (1.2)% |
| C000189686 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Bond Fund |
| Class Name | R5 Class |
| Trading Symbol | ADRVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diversified Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R5 Class $21 0.40% |
| Expenses Paid, Amount | $ 21 |
| Expense Ratio, Percent | 0.40% |
| Net Assets | $ 6,201,262,197 |
| Holdings Count | holding | 577 |
| Advisory Fees Paid, Amount | $ 3,861,188 |
| Investment Company, Portfolio Turnover | 81% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 35.3% Corporate Bonds 21.7% U.S. Treasury Securities 21.3% Collateralized Mortgage Obligations 5.0% Asset-Backed Securities 4.8% Collateralized Loan Obligations 3.7% Commercial Mortgage-Backed Securities 2.0% Preferred Stocks 1.5% Municipal Securities 0.8% U.S. Government Agency Securities 0.8% Sovereign Governments and Agencies 0.2% Short-Term Investments 4.1% Other Assets and Liabilities (1.2)% |
| C000131613 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Bond Fund |
| Class Name | R6 Class |
| Trading Symbol | ADDVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diversified Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $18 0.35% |
| Expenses Paid, Amount | $ 18 |
| Expense Ratio, Percent | 0.35% |
| Net Assets | $ 6,201,262,197 |
| Holdings Count | holding | 577 |
| Advisory Fees Paid, Amount | $ 3,861,188 |
| Investment Company, Portfolio Turnover | 81% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 35.3% Corporate Bonds 21.7% U.S. Treasury Securities 21.3% Collateralized Mortgage Obligations 5.0% Asset-Backed Securities 4.8% Collateralized Loan Obligations 3.7% Commercial Mortgage-Backed Securities 2.0% Preferred Stocks 1.5% Municipal Securities 0.8% U.S. Government Agency Securities 0.8% Sovereign Governments and Agencies 0.2% Short-Term Investments 4.1% Other Assets and Liabilities (1.2)% |
| C000237256 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Bond Fund |
| Class Name | G Class |
| Trading Symbol | ACDOX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Diversified Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment G Class $1 0.01% |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.01% |
| Net Assets | $ 6,201,262,197 |
| Holdings Count | holding | 577 |
| Advisory Fees Paid, Amount | $ 3,861,188 |
| Investment Company, Portfolio Turnover | 81% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Government Agency Mortgage-Backed Securities 35.3% Corporate Bonds 21.7% U.S. Treasury Securities 21.3% Collateralized Mortgage Obligations 5.0% Asset-Backed Securities 4.8% Collateralized Loan Obligations 3.7% Commercial Mortgage-Backed Securities 2.0% Preferred Stocks 1.5% Municipal Securities 0.8% U.S. Government Agency Securities 0.8% Sovereign Governments and Agencies 0.2% Short-Term Investments 4.1% Other Assets and Liabilities (1.2)% |
| C000191071 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Fund |
| Class Name | Investor Class |
| Trading Symbol | AHIVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $40 0.78% |
| Expenses Paid, Amount | $ 40 |
| Expense Ratio, Percent | 0.78% |
| Net Assets | $ 2,312,945,942 |
| Holdings Count | holding | 1,481 |
| Advisory Fees Paid, Amount | $ 3,721,596 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 95.9% Preferred Stocks 1.1% Bank Loan Obligations 0.9% Common Stocks 0.4% Convertible Bonds 0.0% Escrow Interests 0.0% Warrants 0.0% Short-Term Investments 0.7% Other Assets and Liabilities 1.0% |
| C000191072 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Fund |
| Class Name | I Class |
| Trading Symbol | AHIIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $35 0.68% |
| Expenses Paid, Amount | $ 35 |
| Expense Ratio, Percent | 0.68% |
| Net Assets | $ 2,312,945,942 |
| Holdings Count | holding | 1,481 |
| Advisory Fees Paid, Amount | $ 3,721,596 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 95.9% Preferred Stocks 1.1% Bank Loan Obligations 0.9% Common Stocks 0.4% Convertible Bonds 0.0% Escrow Interests 0.0% Warrants 0.0% Short-Term Investments 0.7% Other Assets and Liabilities 1.0% |
| C000191073 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Fund |
| Class Name | Y Class |
| Trading Symbol | NPHIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Y Class $30 0.58% |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.58% |
| Net Assets | $ 2,312,945,942 |
| Holdings Count | holding | 1,481 |
| Advisory Fees Paid, Amount | $ 3,721,596 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 95.9% Preferred Stocks 1.1% Bank Loan Obligations 0.9% Common Stocks 0.4% Convertible Bonds 0.0% Escrow Interests 0.0% Warrants 0.0% Short-Term Investments 0.7% Other Assets and Liabilities 1.0% |
| C000191074 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Fund |
| Class Name | A Class |
| Trading Symbol | AHIAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $53 1.03% |
| Expenses Paid, Amount | $ 53 |
| Expense Ratio, Percent | 1.03% |
| Net Assets | $ 2,312,945,942 |
| Holdings Count | holding | 1,481 |
| Advisory Fees Paid, Amount | $ 3,721,596 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 95.9% Preferred Stocks 1.1% Bank Loan Obligations 0.9% Common Stocks 0.4% Convertible Bonds 0.0% Escrow Interests 0.0% Warrants 0.0% Short-Term Investments 0.7% Other Assets and Liabilities 1.0% |
| C000191075 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Fund |
| Class Name | R5 Class |
| Trading Symbol | AHIEX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R5 Class $30 0.58% |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.58% |
| Net Assets | $ 2,312,945,942 |
| Holdings Count | holding | 1,481 |
| Advisory Fees Paid, Amount | $ 3,721,596 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 95.9% Preferred Stocks 1.1% Bank Loan Obligations 0.9% Common Stocks 0.4% Convertible Bonds 0.0% Escrow Interests 0.0% Warrants 0.0% Short-Term Investments 0.7% Other Assets and Liabilities 1.0% |
| C000191076 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Fund |
| Class Name | R6 Class |
| Trading Symbol | AHIDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $27 0.53% |
| Expenses Paid, Amount | $ 27 |
| Expense Ratio, Percent | 0.53% |
| Net Assets | $ 2,312,945,942 |
| Holdings Count | holding | 1,481 |
| Advisory Fees Paid, Amount | $ 3,721,596 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 95.9% Preferred Stocks 1.1% Bank Loan Obligations 0.9% Common Stocks 0.4% Convertible Bonds 0.0% Escrow Interests 0.0% Warrants 0.0% Short-Term Investments 0.7% Other Assets and Liabilities 1.0% |
| C000237257 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Fund |
| Class Name | G Class |
| Trading Symbol | ACHFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment G Class $0 0.00% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 2,312,945,942 |
| Holdings Count | holding | 1,481 |
| Advisory Fees Paid, Amount | $ 3,721,596 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 95.9% Preferred Stocks 1.1% Bank Loan Obligations 0.9% Common Stocks 0.4% Convertible Bonds 0.0% Escrow Interests 0.0% Warrants 0.0% Short-Term Investments 0.7% Other Assets and Liabilities 1.0% |
| C000017962 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High-Yield Fund |
| Class Name | Investor Class |
| Trading Symbol | ABHIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High-Yield Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $40 0.77% |
| Expenses Paid, Amount | $ 40 |
| Expense Ratio, Percent | 0.77% |
| Net Assets | $ 95,910,822 |
| Holdings Count | holding | 201 |
| Advisory Fees Paid, Amount | $ 354,343 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 80.2% Exchange-Traded Funds 6.9% Preferred Stocks 3.6% Bank Loan Obligations 1.0% Short-Term Investments 14.7% Other Assets and Liabilities (6.4)% |
| C000189687 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High-Yield Fund |
| Class Name | I Class |
| Trading Symbol | AHYHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High-Yield Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $35 0.67% |
| Expenses Paid, Amount | $ 35 |
| Expense Ratio, Percent | 0.67% |
| Net Assets | $ 95,910,822 |
| Holdings Count | holding | 201 |
| Advisory Fees Paid, Amount | $ 354,343 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 80.2% Exchange-Traded Funds 6.9% Preferred Stocks 3.6% Bank Loan Obligations 1.0% Short-Term Investments 14.7% Other Assets and Liabilities (6.4)% |
| C000189688 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High-Yield Fund |
| Class Name | Y Class |
| Trading Symbol | AHYLX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High-Yield Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Y Class $29 0.57% |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.57% |
| Net Assets | $ 95,910,822 |
| Holdings Count | holding | 201 |
| Advisory Fees Paid, Amount | $ 354,343 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 80.2% Exchange-Traded Funds 6.9% Preferred Stocks 3.6% Bank Loan Obligations 1.0% Short-Term Investments 14.7% Other Assets and Liabilities (6.4)% |
| C000017963 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High-Yield Fund |
| Class Name | A Class |
| Trading Symbol | AHYVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High-Yield Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $53 1.02% |
| Expenses Paid, Amount | $ 53 |
| Expense Ratio, Percent | 1.02% |
| Net Assets | $ 95,910,822 |
| Holdings Count | holding | 201 |
| Advisory Fees Paid, Amount | $ 354,343 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 80.2% Exchange-Traded Funds 6.9% Preferred Stocks 3.6% Bank Loan Obligations 1.0% Short-Term Investments 14.7% Other Assets and Liabilities (6.4)% |
| C000017967 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High-Yield Fund |
| Class Name | C Class |
| Trading Symbol | AHDCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High-Yield Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $91 1.77% |
| Expenses Paid, Amount | $ 91 |
| Expense Ratio, Percent | 1.77% |
| Net Assets | $ 95,910,822 |
| Holdings Count | holding | 201 |
| Advisory Fees Paid, Amount | $ 354,343 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 80.2% Exchange-Traded Funds 6.9% Preferred Stocks 3.6% Bank Loan Obligations 1.0% Short-Term Investments 14.7% Other Assets and Liabilities (6.4)% |
| C000017968 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High-Yield Fund |
| Class Name | R Class |
| Trading Symbol | AHYRX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High-Yield Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $65 1.27% |
| Expenses Paid, Amount | $ 65 |
| Expense Ratio, Percent | 1.27% |
| Net Assets | $ 95,910,822 |
| Holdings Count | holding | 201 |
| Advisory Fees Paid, Amount | $ 354,343 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 80.2% Exchange-Traded Funds 6.9% Preferred Stocks 3.6% Bank Loan Obligations 1.0% Short-Term Investments 14.7% Other Assets and Liabilities (6.4)% |
| C000017964 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High-Yield Fund |
| Class Name | R5 Class |
| Trading Symbol | ACYIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High-Yield Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R5 Class $29 0.57% |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.57% |
| Net Assets | $ 95,910,822 |
| Holdings Count | holding | 201 |
| Advisory Fees Paid, Amount | $ 354,343 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 80.2% Exchange-Traded Funds 6.9% Preferred Stocks 3.6% Bank Loan Obligations 1.0% Short-Term Investments 14.7% Other Assets and Liabilities (6.4)% |
| C000131614 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | High-Yield Fund |
| Class Name | R6 Class |
| Trading Symbol | AHYDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about High-Yield Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $27 0.52% |
| Expenses Paid, Amount | $ 27 |
| Expense Ratio, Percent | 0.52% |
| Net Assets | $ 95,910,822 |
| Holdings Count | holding | 201 |
| Advisory Fees Paid, Amount | $ 354,343 |
| Investment Company, Portfolio Turnover | 15% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 80.2% Exchange-Traded Funds 6.9% Preferred Stocks 3.6% Bank Loan Obligations 1.0% Short-Term Investments 14.7% Other Assets and Liabilities (6.4)% |
| C000144171 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Multisector Income Fund |
| Class Name | ASIEX |
| Trading Symbol | Investor Class |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Multisector Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $30 0.58% |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.58% |
| Net Assets | $ 109,579,929 |
| Holdings Count | holding | 379 |
| Advisory Fees Paid, Amount | $ 253,354 |
| Investment Company, Portfolio Turnover | 76% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 50.9% U.S. Government Agency Mortgage-Backed Securities 11.5% Preferred Stocks 9.8% U.S. Treasury Securities 7.3% Asset-Backed Securities 5.9% Collateralized Loan Obligations 4.6% Collateralized Mortgage Obligations 4.3% Commercial Mortgage-Backed Securities 2.9% Bank Loan Obligations 0.5% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.8% Other Assets and Liabilities (2.8)% |
| C000189695 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Multisector Income Fund |
| Class Name | ASIGX |
| Trading Symbol | I Class |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Multisector Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $25 0.48% |
| Expenses Paid, Amount | $ 25 |
| Expense Ratio, Percent | 0.48% |
| Net Assets | $ 109,579,929 |
| Holdings Count | holding | 379 |
| Advisory Fees Paid, Amount | $ 253,354 |
| Investment Company, Portfolio Turnover | 76% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 50.9% U.S. Government Agency Mortgage-Backed Securities 11.5% Preferred Stocks 9.8% U.S. Treasury Securities 7.3% Asset-Backed Securities 5.9% Collateralized Loan Obligations 4.6% Collateralized Mortgage Obligations 4.3% Commercial Mortgage-Backed Securities 2.9% Bank Loan Obligations 0.5% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.8% Other Assets and Liabilities (2.8)% |
| C000189696 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Multisector Income Fund |
| Class Name | ASYIX |
| Trading Symbol | Y Class |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Multisector Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Y Class $20 0.38% |
| Expenses Paid, Amount | $ 20 |
| Expense Ratio, Percent | 0.38% |
| Net Assets | $ 109,579,929 |
| Holdings Count | holding | 379 |
| Advisory Fees Paid, Amount | $ 253,354 |
| Investment Company, Portfolio Turnover | 76% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 50.9% U.S. Government Agency Mortgage-Backed Securities 11.5% Preferred Stocks 9.8% U.S. Treasury Securities 7.3% Asset-Backed Securities 5.9% Collateralized Loan Obligations 4.6% Collateralized Mortgage Obligations 4.3% Commercial Mortgage-Backed Securities 2.9% Bank Loan Obligations 0.5% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.8% Other Assets and Liabilities (2.8)% |
| C000144173 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Multisector Income Fund |
| Class Name | A Class |
| Trading Symbol | ASIQX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Multisector Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $43 0.83% |
| Expenses Paid, Amount | $ 43 |
| Expense Ratio, Percent | 0.83% |
| Net Assets | $ 109,579,929 |
| Holdings Count | holding | 379 |
| Advisory Fees Paid, Amount | $ 253,354 |
| Investment Company, Portfolio Turnover | 76% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 50.9% U.S. Government Agency Mortgage-Backed Securities 11.5% Preferred Stocks 9.8% U.S. Treasury Securities 7.3% Asset-Backed Securities 5.9% Collateralized Loan Obligations 4.6% Collateralized Mortgage Obligations 4.3% Commercial Mortgage-Backed Securities 2.9% Bank Loan Obligations 0.5% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.8% Other Assets and Liabilities (2.8)% |
| C000144168 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Multisector Income Fund |
| Class Name | C Class |
| Trading Symbol | ASIHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Multisector Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $81 1.58% |
| Expenses Paid, Amount | $ 81 |
| Expense Ratio, Percent | 1.58% |
| Net Assets | $ 109,579,929 |
| Holdings Count | holding | 379 |
| Advisory Fees Paid, Amount | $ 253,354 |
| Investment Company, Portfolio Turnover | 76% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 50.9% U.S. Government Agency Mortgage-Backed Securities 11.5% Preferred Stocks 9.8% U.S. Treasury Securities 7.3% Asset-Backed Securities 5.9% Collateralized Loan Obligations 4.6% Collateralized Mortgage Obligations 4.3% Commercial Mortgage-Backed Securities 2.9% Bank Loan Obligations 0.5% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.8% Other Assets and Liabilities (2.8)% |
| C000144169 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Multisector Income Fund |
| Class Name | R Class |
| Trading Symbol | ASIWX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Multisector Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $56 1.08% |
| Expenses Paid, Amount | $ 56 |
| Expense Ratio, Percent | 1.08% |
| Net Assets | $ 109,579,929 |
| Holdings Count | holding | 379 |
| Advisory Fees Paid, Amount | $ 253,354 |
| Investment Company, Portfolio Turnover | 76% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 50.9% U.S. Government Agency Mortgage-Backed Securities 11.5% Preferred Stocks 9.8% U.S. Treasury Securities 7.3% Asset-Backed Securities 5.9% Collateralized Loan Obligations 4.6% Collateralized Mortgage Obligations 4.3% Commercial Mortgage-Backed Securities 2.9% Bank Loan Obligations 0.5% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.8% Other Assets and Liabilities (2.8)% |
| C000144172 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Multisector Income Fund |
| Class Name | R5 Class |
| Trading Symbol | ASIJX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Multisector Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R5 Class $20 0.38% |
| Expenses Paid, Amount | $ 20 |
| Expense Ratio, Percent | 0.38% |
| Net Assets | $ 109,579,929 |
| Holdings Count | holding | 379 |
| Advisory Fees Paid, Amount | $ 253,354 |
| Investment Company, Portfolio Turnover | 76% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 50.9% U.S. Government Agency Mortgage-Backed Securities 11.5% Preferred Stocks 9.8% U.S. Treasury Securities 7.3% Asset-Backed Securities 5.9% Collateralized Loan Obligations 4.6% Collateralized Mortgage Obligations 4.3% Commercial Mortgage-Backed Securities 2.9% Bank Loan Obligations 0.5% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.8% Other Assets and Liabilities (2.8)% |
| C000144170 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Multisector Income Fund |
| Class Name | R6 Class |
| Trading Symbol | ASIPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Multisector Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $17 0.33% |
| Expenses Paid, Amount | $ 17 |
| Expense Ratio, Percent | 0.33% |
| Net Assets | $ 109,579,929 |
| Holdings Count | holding | 379 |
| Advisory Fees Paid, Amount | $ 253,354 |
| Investment Company, Portfolio Turnover | 76% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 50.9% U.S. Government Agency Mortgage-Backed Securities 11.5% Preferred Stocks 9.8% U.S. Treasury Securities 7.3% Asset-Backed Securities 5.9% Collateralized Loan Obligations 4.6% Collateralized Mortgage Obligations 4.3% Commercial Mortgage-Backed Securities 2.9% Bank Loan Obligations 0.5% Sovereign Governments and Agencies 0.3% Short-Term Investments 4.8% Other Assets and Liabilities (2.8)% |
| C000017976 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Prime Money Market Fund |
| Class Name | Investor Class |
| Trading Symbol | BPRXX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Prime Money Market Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $29 0.57% |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.57% |
| Net Assets | $ 2,239,415,511 |
| Holdings Count | holding | 137 |
| Advisory Fees Paid, Amount | $ 6,199,740 |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $2,239,415,511 Management Fees (dollars paid during the reporting period) $6,199,740 Total Number of Portfolio Holdings 137 7-Day Current Yield - Investor Class 4.55 % 7-Day Effective Yield - Investor Class 4.66 % |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Portfolio at a Glance Corporate Bonds 32.2% Weighted Average Maturity 34 days Municipal Securities 26.3% Weighted Average Life 57 days Commercial Paper 21.2% U.S. Treasury Securities 20.5% Certificates of Deposit 2.1% Other Assets and Liabilities (2.3)% |
| C000017977 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Prime Money Market Fund |
| Class Name | A Class |
| Trading Symbol | ACAXX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Prime Money Market Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $42 0.82% |
| Expenses Paid, Amount | $ 42 |
| Expense Ratio, Percent | 0.82% |
| Net Assets | $ 2,239,415,511 |
| Holdings Count | holding | 137 |
| Advisory Fees Paid, Amount | $ 6,199,740 |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $2,239,415,511 Management Fees (dollars paid during the reporting period) $6,199,740 Total Number of Portfolio Holdings 137 7-Day Current Yield - A Class 4.30 % 7-Day Effective Yield - A Class 4.40 % |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Portfolio at a Glance Corporate Bonds 32.2% Weighted Average Maturity 34 days Municipal Securities 26.3% Weighted Average Life 57 days Commercial Paper 21.2% U.S. Treasury Securities 20.5% Certificates of Deposit 2.1% Other Assets and Liabilities (2.3)% |
| C000017980 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Prime Money Market Fund |
| Class Name | C Class |
| Trading Symbol | ARCXX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Prime Money Market Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $67 1.32% |
| Expenses Paid, Amount | $ 67 |
| Expense Ratio, Percent | 1.32% |
| Net Assets | $ 2,239,415,511 |
| Holdings Count | holding | 137 |
| Advisory Fees Paid, Amount | $ 6,199,740 |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $2,239,415,511 Management Fees (dollars paid during the reporting period) $6,199,740 Total Number of Portfolio Holdings 137 7-Day Current Yield - C Class 3.81 % 7-Day Effective Yield - C Class 3.88 % |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Portfolio at a Glance Corporate Bonds 32.2% Weighted Average Maturity 34 days Municipal Securities 26.3% Weighted Average Life 57 days Commercial Paper 21.2% U.S. Treasury Securities 20.5% Certificates of Deposit 2.1% Other Assets and Liabilities (2.3)% |
| C000039177 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Fund |
| Class Name | Investor Class |
| Trading Symbol | ACSNX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $29 0.56% |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.56% |
| Net Assets | $ 1,346,044,199 |
| Holdings Count | holding | 285 |
| Advisory Fees Paid, Amount | $ 1,546,325 |
| Investment Company, Portfolio Turnover | 168% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 33.3% U.S. Treasury Securities 29.4% Collateralized Mortgage Obligations 12.9% Preferred Stocks 6.3% Asset-Backed Securities 4.2% Collateralized Loan Obligations 3.8% Commercial Mortgage-Backed Securities 3.4% Short-Term Investments 4.9% Other Assets and Liabilities 1.8% |
| C000189692 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Fund |
| Class Name | I Class |
| Trading Symbol | ASHHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $24 0.46% |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.46% |
| Net Assets | $ 1,346,044,199 |
| Holdings Count | holding | 285 |
| Advisory Fees Paid, Amount | $ 1,546,325 |
| Investment Company, Portfolio Turnover | 168% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 33.3% U.S. Treasury Securities 29.4% Collateralized Mortgage Obligations 12.9% Preferred Stocks 6.3% Asset-Backed Securities 4.2% Collateralized Loan Obligations 3.8% Commercial Mortgage-Backed Securities 3.4% Short-Term Investments 4.9% Other Assets and Liabilities 1.8% |
| C000039179 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Fund |
| Class Name | A Class |
| Trading Symbol | ACSQX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $41 0.81% |
| Expenses Paid, Amount | $ 41 |
| Expense Ratio, Percent | 0.81% |
| Net Assets | $ 1,346,044,199 |
| Holdings Count | holding | 285 |
| Advisory Fees Paid, Amount | $ 1,546,325 |
| Investment Company, Portfolio Turnover | 168% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 33.3% U.S. Treasury Securities 29.4% Collateralized Mortgage Obligations 12.9% Preferred Stocks 6.3% Asset-Backed Securities 4.2% Collateralized Loan Obligations 3.8% Commercial Mortgage-Backed Securities 3.4% Short-Term Investments 4.9% Other Assets and Liabilities 1.8% |
| C000039175 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Fund |
| Class Name | C Class |
| Trading Symbol | ACSKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $80 1.56% |
| Expenses Paid, Amount | $ 80 |
| Expense Ratio, Percent | 1.56% |
| Net Assets | $ 1,346,044,199 |
| Holdings Count | holding | 285 |
| Advisory Fees Paid, Amount | $ 1,546,325 |
| Investment Company, Portfolio Turnover | 168% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 33.3% U.S. Treasury Securities 29.4% Collateralized Mortgage Obligations 12.9% Preferred Stocks 6.3% Asset-Backed Securities 4.2% Collateralized Loan Obligations 3.8% Commercial Mortgage-Backed Securities 3.4% Short-Term Investments 4.9% Other Assets and Liabilities 1.8% |
| C000039176 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Fund |
| Class Name | R Class |
| Trading Symbol | ACSPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $54 1.06% |
| Expenses Paid, Amount | $ 54 |
| Expense Ratio, Percent | 1.06% |
| Net Assets | $ 1,346,044,199 |
| Holdings Count | holding | 285 |
| Advisory Fees Paid, Amount | $ 1,546,325 |
| Investment Company, Portfolio Turnover | 168% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 33.3% U.S. Treasury Securities 29.4% Collateralized Mortgage Obligations 12.9% Preferred Stocks 6.3% Asset-Backed Securities 4.2% Collateralized Loan Obligations 3.8% Commercial Mortgage-Backed Securities 3.4% Short-Term Investments 4.9% Other Assets and Liabilities 1.8% |
| C000039178 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Fund |
| Class Name | R5 Class |
| Trading Symbol | ACSUX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R5 Class $18 0.36% |
| Expenses Paid, Amount | $ 18 |
| Expense Ratio, Percent | 0.36% |
| Net Assets | $ 1,346,044,199 |
| Holdings Count | holding | 285 |
| Advisory Fees Paid, Amount | $ 1,546,325 |
| Investment Company, Portfolio Turnover | 168% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 33.3% U.S. Treasury Securities 29.4% Collateralized Mortgage Obligations 12.9% Preferred Stocks 6.3% Asset-Backed Securities 4.2% Collateralized Loan Obligations 3.8% Commercial Mortgage-Backed Securities 3.4% Short-Term Investments 4.9% Other Assets and Liabilities 1.8% |
| C000194393 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Fund |
| Class Name | R6 Class |
| Trading Symbol | ASDDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $16 0.31% |
| Expenses Paid, Amount | $ 16 |
| Expense Ratio, Percent | 0.31% |
| Net Assets | $ 1,346,044,199 |
| Holdings Count | holding | 285 |
| Advisory Fees Paid, Amount | $ 1,546,325 |
| Investment Company, Portfolio Turnover | 168% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 33.3% U.S. Treasury Securities 29.4% Collateralized Mortgage Obligations 12.9% Preferred Stocks 6.3% Asset-Backed Securities 4.2% Collateralized Loan Obligations 3.8% Commercial Mortgage-Backed Securities 3.4% Short-Term Investments 4.9% Other Assets and Liabilities 1.8% |
| C000224786 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Fund |
| Class Name | G Class |
| Trading Symbol | ASDOX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment G Class $1 0.01% |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.01% |
| Net Assets | $ 1,346,044,199 |
| Holdings Count | holding | 285 |
| Advisory Fees Paid, Amount | $ 1,546,325 |
| Investment Company, Portfolio Turnover | 168% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 33.3% U.S. Treasury Securities 29.4% Collateralized Mortgage Obligations 12.9% Preferred Stocks 6.3% Asset-Backed Securities 4.2% Collateralized Loan Obligations 3.8% Commercial Mortgage-Backed Securities 3.4% Short-Term Investments 4.9% Other Assets and Liabilities 1.8% |
| C000017969 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Inflation Protection Bond Fund |
| Class Name | Investor Class |
| Trading Symbol | APOIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Inflation Protection Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $32 0.63% |
| Expenses Paid, Amount | $ 32 |
| Expense Ratio, Percent | 0.63% |
| Net Assets | $ 1,775,751,652 |
| Holdings Count | holding | 79 |
| Advisory Fees Paid, Amount | $ 2,566,728 |
| Investment Company, Portfolio Turnover | 20% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Treasury Securities 87.1% Corporate Bonds 3.6% Asset-Backed Securities 2.4% Collateralized Mortgage Obligations 2.0% Preferred Stocks 1.9% Commercial Mortgage-Backed Securities 1.2% Collateralized Loan Obligations 0.4% Short-Term Investments 1.3% Other Assets and Liabilities 0.1% |
| C000189689 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Inflation Protection Bond Fund |
| Class Name | I Class |
| Trading Symbol | APOHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Inflation Protection Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $27 0.53% |
| Expenses Paid, Amount | $ 27 |
| Expense Ratio, Percent | 0.53% |
| Net Assets | $ 1,775,751,652 |
| Holdings Count | holding | 79 |
| Advisory Fees Paid, Amount | $ 2,566,728 |
| Investment Company, Portfolio Turnover | 20% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Treasury Securities 87.1% Corporate Bonds 3.6% Asset-Backed Securities 2.4% Collateralized Mortgage Obligations 2.0% Preferred Stocks 1.9% Commercial Mortgage-Backed Securities 1.2% Collateralized Loan Obligations 0.4% Short-Term Investments 1.3% Other Assets and Liabilities 0.1% |
| C000189690 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Inflation Protection Bond Fund |
| Class Name | Y Class |
| Trading Symbol | APOYX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Inflation Protection Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Y Class $22 0.43% |
| Expenses Paid, Amount | $ 22 |
| Expense Ratio, Percent | 0.43% |
| Net Assets | $ 1,775,751,652 |
| Holdings Count | holding | 79 |
| Advisory Fees Paid, Amount | $ 2,566,728 |
| Investment Company, Portfolio Turnover | 20% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Treasury Securities 87.1% Corporate Bonds 3.6% Asset-Backed Securities 2.4% Collateralized Mortgage Obligations 2.0% Preferred Stocks 1.9% Commercial Mortgage-Backed Securities 1.2% Collateralized Loan Obligations 0.4% Short-Term Investments 1.3% Other Assets and Liabilities 0.1% |
| C000017971 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Inflation Protection Bond Fund |
| Class Name | A Class |
| Trading Symbol | APOAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Inflation Protection Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $45 0.88% |
| Expenses Paid, Amount | $ 45 |
| Expense Ratio, Percent | 0.88% |
| Net Assets | $ 1,775,751,652 |
| Holdings Count | holding | 79 |
| Advisory Fees Paid, Amount | $ 2,566,728 |
| Investment Company, Portfolio Turnover | 20% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Treasury Securities 87.1% Corporate Bonds 3.6% Asset-Backed Securities 2.4% Collateralized Mortgage Obligations 2.0% Preferred Stocks 1.9% Commercial Mortgage-Backed Securities 1.2% Collateralized Loan Obligations 0.4% Short-Term Investments 1.3% Other Assets and Liabilities 0.1% |
| C000017973 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Inflation Protection Bond Fund |
| Class Name | C Class |
| Trading Symbol | APOCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Inflation Protection Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $83 1.63% |
| Expenses Paid, Amount | $ 83 |
| Expense Ratio, Percent | 1.63% |
| Net Assets | $ 1,775,751,652 |
| Holdings Count | holding | 79 |
| Advisory Fees Paid, Amount | $ 2,566,728 |
| Investment Company, Portfolio Turnover | 20% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Treasury Securities 87.1% Corporate Bonds 3.6% Asset-Backed Securities 2.4% Collateralized Mortgage Obligations 2.0% Preferred Stocks 1.9% Commercial Mortgage-Backed Securities 1.2% Collateralized Loan Obligations 0.4% Short-Term Investments 1.3% Other Assets and Liabilities 0.1% |
| C000017974 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Inflation Protection Bond Fund |
| Class Name | R Class |
| Trading Symbol | APORX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Inflation Protection Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $58 1.13% |
| Expenses Paid, Amount | $ 58 |
| Expense Ratio, Percent | 1.13% |
| Net Assets | $ 1,775,751,652 |
| Holdings Count | holding | 79 |
| Advisory Fees Paid, Amount | $ 2,566,728 |
| Investment Company, Portfolio Turnover | 20% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Treasury Securities 87.1% Corporate Bonds 3.6% Asset-Backed Securities 2.4% Collateralized Mortgage Obligations 2.0% Preferred Stocks 1.9% Commercial Mortgage-Backed Securities 1.2% Collateralized Loan Obligations 0.4% Short-Term Investments 1.3% Other Assets and Liabilities 0.1% |
| C000017970 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Inflation Protection Bond Fund |
| Class Name | R5 Class |
| Trading Symbol | APISX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Inflation Protection Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R5 Class $22 0.43% |
| Expenses Paid, Amount | $ 22 |
| Expense Ratio, Percent | 0.43% |
| Net Assets | $ 1,775,751,652 |
| Holdings Count | holding | 79 |
| Advisory Fees Paid, Amount | $ 2,566,728 |
| Investment Company, Portfolio Turnover | 20% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Treasury Securities 87.1% Corporate Bonds 3.6% Asset-Backed Securities 2.4% Collateralized Mortgage Obligations 2.0% Preferred Stocks 1.9% Commercial Mortgage-Backed Securities 1.2% Collateralized Loan Obligations 0.4% Short-Term Investments 1.3% Other Assets and Liabilities 0.1% |
| C000131615 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Inflation Protection Bond Fund |
| Class Name | R6 Class |
| Trading Symbol | APODX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Inflation Protection Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $19 0.38% |
| Expenses Paid, Amount | $ 19 |
| Expense Ratio, Percent | 0.38% |
| Net Assets | $ 1,775,751,652 |
| Holdings Count | holding | 79 |
| Advisory Fees Paid, Amount | $ 2,566,728 |
| Investment Company, Portfolio Turnover | 20% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Treasury Securities 87.1% Corporate Bonds 3.6% Asset-Backed Securities 2.4% Collateralized Mortgage Obligations 2.0% Preferred Stocks 1.9% Commercial Mortgage-Backed Securities 1.2% Collateralized Loan Obligations 0.4% Short-Term Investments 1.3% Other Assets and Liabilities 0.1% |
| C000194391 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Inflation Protection Bond Fund |
| Class Name | G Class |
| Trading Symbol | APOGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Inflation Protection Bond Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment G Class $4 0.07% |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.07% |
| Net Assets | $ 1,775,751,652 |
| Holdings Count | holding | 79 |
| Advisory Fees Paid, Amount | $ 2,566,728 |
| Investment Company, Portfolio Turnover | 20% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) U.S. Treasury Securities 87.1% Corporate Bonds 3.6% Asset-Backed Securities 2.4% Collateralized Mortgage Obligations 2.0% Preferred Stocks 1.9% Commercial Mortgage-Backed Securities 1.2% Collateralized Loan Obligations 0.4% Short-Term Investments 1.3% Other Assets and Liabilities 0.1% |
| C000144162 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Strategic Income Fund |
| Class Name | Investor Class |
| Trading Symbol | ASDVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Strategic Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $27 0.52% |
| Expenses Paid, Amount | $ 27 |
| Expense Ratio, Percent | 0.52% |
| Net Assets | $ 643,214,744 |
| Holdings Count | holding | 308 |
| Advisory Fees Paid, Amount | $ 1,353,776 |
| Investment Company, Portfolio Turnover | 92% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 43.8% U.S. Treasury Securities 22.9% Collateralized Mortgage Obligations 8.9% Preferred Stocks 6.8% Collateralized Loan Obligations 5.3% Asset-Backed Securities 5.0% Commercial Mortgage-Backed Securities 3.4% Bank Loan Obligations 0.4% Sovereign Governments and Agencies 0.2% Short-Term Investments 3.6% Other Assets and Liabilities (0.3)% |
| C000189693 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Strategic Income Fund |
| Class Name | I Class |
| Trading Symbol | ASDHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Strategic Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $22 0.42% |
| Expenses Paid, Amount | $ 22 |
| Expense Ratio, Percent | 0.42% |
| Net Assets | $ 643,214,744 |
| Holdings Count | holding | 308 |
| Advisory Fees Paid, Amount | $ 1,353,776 |
| Investment Company, Portfolio Turnover | 92% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 43.8% U.S. Treasury Securities 22.9% Collateralized Mortgage Obligations 8.9% Preferred Stocks 6.8% Collateralized Loan Obligations 5.3% Asset-Backed Securities 5.0% Commercial Mortgage-Backed Securities 3.4% Bank Loan Obligations 0.4% Sovereign Governments and Agencies 0.2% Short-Term Investments 3.6% Other Assets and Liabilities (0.3)% |
| C000189694 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Strategic Income Fund |
| Class Name | Y Class |
| Trading Symbol | ASYDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Strategic Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Y Class $16 0.32% |
| Expenses Paid, Amount | $ 16 |
| Expense Ratio, Percent | 0.32% |
| Net Assets | $ 643,214,744 |
| Holdings Count | holding | 308 |
| Advisory Fees Paid, Amount | $ 1,353,776 |
| Investment Company, Portfolio Turnover | 92% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 43.8% U.S. Treasury Securities 22.9% Collateralized Mortgage Obligations 8.9% Preferred Stocks 6.8% Collateralized Loan Obligations 5.3% Asset-Backed Securities 5.0% Commercial Mortgage-Backed Securities 3.4% Bank Loan Obligations 0.4% Sovereign Governments and Agencies 0.2% Short-Term Investments 3.6% Other Assets and Liabilities (0.3)% |
| C000144164 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Strategic Income Fund |
| Class Name | A Class |
| Trading Symbol | ASADX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Strategic Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $39 0.77% |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.77% |
| Net Assets | $ 643,214,744 |
| Holdings Count | holding | 308 |
| Advisory Fees Paid, Amount | $ 1,353,776 |
| Investment Company, Portfolio Turnover | 92% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 43.8% U.S. Treasury Securities 22.9% Collateralized Mortgage Obligations 8.9% Preferred Stocks 6.8% Collateralized Loan Obligations 5.3% Asset-Backed Securities 5.0% Commercial Mortgage-Backed Securities 3.4% Bank Loan Obligations 0.4% Sovereign Governments and Agencies 0.2% Short-Term Investments 3.6% Other Assets and Liabilities (0.3)% |
| C000144165 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Strategic Income Fund |
| Class Name | C Class |
| Trading Symbol | ASCDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Strategic Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $78 1.52% |
| Expenses Paid, Amount | $ 78 |
| Expense Ratio, Percent | 1.52% |
| Net Assets | $ 643,214,744 |
| Holdings Count | holding | 308 |
| Advisory Fees Paid, Amount | $ 1,353,776 |
| Investment Company, Portfolio Turnover | 92% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 43.8% U.S. Treasury Securities 22.9% Collateralized Mortgage Obligations 8.9% Preferred Stocks 6.8% Collateralized Loan Obligations 5.3% Asset-Backed Securities 5.0% Commercial Mortgage-Backed Securities 3.4% Bank Loan Obligations 0.4% Sovereign Governments and Agencies 0.2% Short-Term Investments 3.6% Other Assets and Liabilities (0.3)% |
| C000144166 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Strategic Income Fund |
| Class Name | R Class |
| Trading Symbol | ASDRX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Strategic Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 1.02% |
| Expenses Paid, Amount | $ 52 |
| Expense Ratio, Percent | 1.02% |
| Net Assets | $ 643,214,744 |
| Holdings Count | holding | 308 |
| Advisory Fees Paid, Amount | $ 1,353,776 |
| Investment Company, Portfolio Turnover | 92% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 43.8% U.S. Treasury Securities 22.9% Collateralized Mortgage Obligations 8.9% Preferred Stocks 6.8% Collateralized Loan Obligations 5.3% Asset-Backed Securities 5.0% Commercial Mortgage-Backed Securities 3.4% Bank Loan Obligations 0.4% Sovereign Governments and Agencies 0.2% Short-Term Investments 3.6% Other Assets and Liabilities (0.3)% |
| C000144163 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Strategic Income Fund |
| Class Name | R5 Class |
| Trading Symbol | ASDJX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Strategic Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R5 Class $16 0.32% |
| Expenses Paid, Amount | $ 16 |
| Expense Ratio, Percent | 0.32% |
| Net Assets | $ 643,214,744 |
| Holdings Count | holding | 308 |
| Advisory Fees Paid, Amount | $ 1,353,776 |
| Investment Company, Portfolio Turnover | 92% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 43.8% U.S. Treasury Securities 22.9% Collateralized Mortgage Obligations 8.9% Preferred Stocks 6.8% Collateralized Loan Obligations 5.3% Asset-Backed Securities 5.0% Commercial Mortgage-Backed Securities 3.4% Bank Loan Obligations 0.4% Sovereign Governments and Agencies 0.2% Short-Term Investments 3.6% Other Assets and Liabilities (0.3)% |
| C000144167 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Short Duration Strategic Income Fund |
| Class Name | R6 Class |
| Trading Symbol | ASXDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Short Duration Strategic Income Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $14 0.27% |
| Expenses Paid, Amount | $ 14 |
| Expense Ratio, Percent | 0.27% |
| Net Assets | $ 643,214,744 |
| Holdings Count | holding | 308 |
| Advisory Fees Paid, Amount | $ 1,353,776 |
| Investment Company, Portfolio Turnover | 92% |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Corporate Bonds 43.8% U.S. Treasury Securities 22.9% Collateralized Mortgage Obligations 8.9% Preferred Stocks 6.8% Collateralized Loan Obligations 5.3% Asset-Backed Securities 5.0% Commercial Mortgage-Backed Securities 3.4% Bank Loan Obligations 0.4% Sovereign Governments and Agencies 0.2% Short-Term Investments 3.6% Other Assets and Liabilities (0.3)% |
| C000017975 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | U.S. Government Money Market Fund |
| Class Name | Investor Class |
| Trading Symbol | TCRXX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about U.S. Government Money Market Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $23 0.45% |
| Expenses Paid, Amount | $ 23 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 898,057,944 |
| Holdings Count | holding | 66 |
| Advisory Fees Paid, Amount | $ 1,823,387 |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $898,057,944 Management Fees (dollars paid during the reporting period) $1,823,387 Total Number of Portfolio Holdings 66 7-Day Current Yield - Investor Class 4.53 % 7-Day Effective Yield - Investor Class 4.63 % |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Portfolio at a Glance Corporate Bonds 41.0% Weighted Average Maturity 11 days Repurchase Agreements 31.8% Weighted Average Life 49 days U.S. Treasury Securities 20.7% U.S. Government Agency Securities 10.9% Municipal Securities 3.1% Other Assets and Liabilities (7.5)% |
| C000162988 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | U.S. Government Money Market Fund |
| Class Name | A Class |
| Trading Symbol | AGQXX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about U.S. Government Money Market Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $36 0.70% |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.70% |
| Net Assets | $ 898,057,944 |
| Holdings Count | holding | 66 |
| Advisory Fees Paid, Amount | $ 1,823,387 |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $898,057,944 Management Fees (dollars paid during the reporting period) $1,823,387 Total Number of Portfolio Holdings 66 7-Day Current Yield - A Class 4.28 % 7-Day Effective Yield - A Class 4.37 % |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Portfolio at a Glance Corporate Bonds 41.0% Weighted Average Maturity 11 days Repurchase Agreements 31.8% Weighted Average Life 49 days U.S. Treasury Securities 20.7% U.S. Government Agency Securities 10.9% Municipal Securities 3.1% Other Assets and Liabilities (7.5)% |
| C000162989 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | U.S. Government Money Market Fund |
| Class Name | C Class |
| Trading Symbol | AGHXX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about U.S. Government Money Market Fund for the period of April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $61 1.20% |
| Expenses Paid, Amount | $ 61 |
| Expense Ratio, Percent | 1.20% |
| Net Assets | $ 898,057,944 |
| Holdings Count | holding | 66 |
| Advisory Fees Paid, Amount | $ 1,823,387 |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $898,057,944 Management Fees (dollars paid during the reporting period) $1,823,387 Total Number of Portfolio Holdings 66 7-Day Current Yield - C Class 3.78 % 7-Day Effective Yield - C Class 3.85 % |
| Holdings [Text Block] | Fund Holdings Types of Investments in Portfolio (as a % of net assets) Portfolio at a Glance Corporate Bonds 41.0% Weighted Average Maturity 11 days Repurchase Agreements 31.8% Weighted Average Life 49 days U.S. Treasury Securities 20.7% U.S. Government Agency Securities 10.9% Municipal Securities 3.1% Other Assets and Liabilities (7.5)% |
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| C000039168 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.70% |
| C000039168 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.80% |
| C000039168 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000039168 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| C000039168 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000039168 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000039168 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000039168 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000039168 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000039168 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000039168 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000039168 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000189691 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.70% |
| C000189691 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.80% |
| C000189691 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000189691 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| C000189691 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000189691 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000189691 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000189691 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000189691 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000189691 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000189691 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000189691 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000039170 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.70% |
| C000039170 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.80% |
| C000039170 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000039170 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| C000039170 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000039170 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000039170 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000039170 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000039170 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000039170 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000039170 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000039170 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000039172 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.70% |
| C000039172 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.80% |
| C000039172 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000039172 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| C000039172 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000039172 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000039172 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000039172 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000039172 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000039172 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000039172 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000039172 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000039173 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.70% |
| C000039173 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.80% |
| C000039173 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000039173 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| C000039173 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000039173 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000039173 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000039173 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000039173 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000039173 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000039173 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000039173 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000039169 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.70% |
| C000039169 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.80% |
| C000039169 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000039169 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| C000039169 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000039169 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000039169 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000039169 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000039169 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000039169 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000039169 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000039169 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000222299 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.70% |
| C000222299 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.80% |
| C000222299 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000222299 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| C000222299 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000222299 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000222299 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000222299 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000222299 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000222299 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000222299 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000222299 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000017955 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.30% |
| C000017955 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000017955 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000017955 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.30% |
| C000017955 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000017955 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000017955 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000017955 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000017955 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000017955 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000017955 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000017955 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000017955 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000017957 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.30% |
| C000017957 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000017957 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000017957 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.30% |
| C000017957 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000017957 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000017957 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000017957 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000017957 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000017957 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000017957 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000017957 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000017957 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000189684 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.30% |
| C000189684 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000189684 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000189684 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.30% |
| C000189684 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000189684 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000189684 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000189684 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000189684 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000189684 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000189684 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000189684 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000189684 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000017956 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.30% |
| C000017956 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000017956 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000017956 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.30% |
| C000017956 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000017956 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000017956 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000017956 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000017956 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000017956 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000017956 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000017956 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000017956 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000017960 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.30% |
| C000017960 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000017960 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000017960 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.30% |
| C000017960 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000017960 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000017960 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000017960 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000017960 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000017960 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000017960 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000017960 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000017960 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000017961 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.30% |
| C000017961 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000017961 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000017961 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.30% |
| C000017961 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000017961 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000017961 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000017961 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000017961 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000017961 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000017961 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000017961 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000017961 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000189686 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.30% |
| C000189686 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000189686 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000189686 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.30% |
| C000189686 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000189686 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000189686 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000189686 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000189686 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000189686 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000189686 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000189686 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000189686 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000131613 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.30% |
| C000131613 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000131613 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000131613 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.30% |
| C000131613 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000131613 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000131613 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000131613 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000131613 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000131613 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000131613 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000131613 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000131613 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000237256 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.30% |
| C000237256 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000237256 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000237256 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.30% |
| C000237256 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000237256 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000237256 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000237256 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000237256 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000237256 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000237256 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000237256 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.20%) |
| C000237256 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000191071 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.90% |
| C000191071 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000191071 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| C000191071 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000191071 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000191071 [Member] | Common Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000191071 [Member] | Convertible Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191071 [Member] | Escrow Interests [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191071 [Member] | Warrant [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191073 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.90% |
| C000191073 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000191073 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| C000191073 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000191073 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000191073 [Member] | Common Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000191073 [Member] | Convertible Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191073 [Member] | Escrow Interests [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191073 [Member] | Warrant [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191074 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.90% |
| C000191074 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000191074 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| C000191074 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000191074 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000191074 [Member] | Common Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000191074 [Member] | Convertible Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191074 [Member] | Escrow Interests [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191074 [Member] | Warrant [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191075 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.90% |
| C000191075 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000191075 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| C000191075 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000191075 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000191075 [Member] | Common Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000191075 [Member] | Convertible Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191075 [Member] | Escrow Interests [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191075 [Member] | Warrant [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191076 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.90% |
| C000191076 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000191076 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| C000191076 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000191076 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000191076 [Member] | Common Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000191076 [Member] | Convertible Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191076 [Member] | Escrow Interests [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000191076 [Member] | Warrant [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000237257 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.90% |
| C000237257 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000237257 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| C000237257 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000237257 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000237257 [Member] | Common Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000237257 [Member] | Convertible Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000237257 [Member] | Escrow Interests [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000237257 [Member] | Warrant [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000017962 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.20% |
| C000017962 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000017962 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| C000017962 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (6.40%) |
| C000017962 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000017962 [Member] | Exchange-Traded Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| C000189687 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.20% |
| C000189687 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000189687 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| C000189687 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (6.40%) |
| C000189687 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000189687 [Member] | Exchange-Traded Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| C000189688 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.20% |
| C000189688 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000189688 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| C000189688 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (6.40%) |
| C000189688 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000189688 [Member] | Exchange-Traded Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| C000017963 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.20% |
| C000017963 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000017963 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| C000017963 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (6.40%) |
| C000017963 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000017963 [Member] | Exchange-Traded Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| C000017967 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.20% |
| C000017967 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000017967 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| C000017967 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (6.40%) |
| C000017967 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000017967 [Member] | Exchange-Traded Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| C000017968 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.20% |
| C000017968 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000017968 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| C000017968 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (6.40%) |
| C000017968 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000017968 [Member] | Exchange-Traded Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| C000017964 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.20% |
| C000017964 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000017964 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| C000017964 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (6.40%) |
| C000017964 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000017964 [Member] | Exchange-Traded Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| C000131614 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.20% |
| C000131614 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000131614 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| C000131614 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (6.40%) |
| C000131614 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000131614 [Member] | Exchange-Traded Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| C000144171 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| C000144171 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.90% |
| C000144171 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000144171 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000144171 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000144171 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000144171 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000144171 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000144171 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000144171 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000144171 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.80%) |
| C000144171 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000189695 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| C000189695 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.90% |
| C000189695 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000189695 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000189695 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000189695 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000189695 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000189695 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000189695 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000189695 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000189695 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.80%) |
| C000189695 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000189696 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| C000189696 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.90% |
| C000189696 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000189696 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000189696 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000189696 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000189696 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000189696 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000189696 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000189696 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000189696 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.80%) |
| C000189696 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000144173 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| C000144173 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.90% |
| C000144173 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000144173 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000144173 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000144173 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000144173 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000144173 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000144173 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000144173 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000144173 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.80%) |
| C000144173 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000144168 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| C000144168 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.90% |
| C000144168 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000144168 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000144168 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000144168 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000144168 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000144168 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000144168 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000144168 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000144168 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.80%) |
| C000144168 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000144169 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| C000144169 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.90% |
| C000144169 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000144169 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000144169 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000144169 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000144169 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000144169 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000144169 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000144169 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000144169 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.80%) |
| C000144169 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000144172 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| C000144172 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.90% |
| C000144172 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000144172 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000144172 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000144172 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000144172 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000144172 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000144172 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000144172 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000144172 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.80%) |
| C000144172 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000144170 [Member] | U.S. Government Agency Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| C000144170 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.90% |
| C000144170 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000144170 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000144170 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000144170 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000144170 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000144170 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000144170 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000144170 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000144170 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.80%) |
| C000144170 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000017976 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.20% |
| C000017976 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.50% |
| C000017976 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.30% |
| C000017976 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.30%) |
| C000017976 [Member] | Commercial Paper Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| C000017976 [Member] | Certificates of Deposit [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000017977 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.20% |
| C000017977 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.50% |
| C000017977 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.30% |
| C000017977 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.30%) |
| C000017977 [Member] | Commercial Paper Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| C000017977 [Member] | Certificates of Deposit [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000017980 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.20% |
| C000017980 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.50% |
| C000017980 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.30% |
| C000017980 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (2.30%) |
| C000017980 [Member] | Commercial Paper Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| C000017980 [Member] | Certificates of Deposit [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000039177 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| C000039177 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000039177 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.40% |
| C000039177 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| C000039177 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000039177 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000039177 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000039177 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000039177 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000189692 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| C000189692 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000189692 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.40% |
| C000189692 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| C000189692 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000189692 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000189692 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000189692 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000189692 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000039179 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| C000039179 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000039179 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.40% |
| C000039179 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| C000039179 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000039179 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000039179 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000039179 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000039179 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000039175 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| C000039175 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000039175 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.40% |
| C000039175 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| C000039175 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000039175 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000039175 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000039175 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000039175 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000039176 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| C000039176 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000039176 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.40% |
| C000039176 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| C000039176 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000039176 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000039176 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000039176 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000039176 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000039178 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| C000039178 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000039178 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.40% |
| C000039178 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| C000039178 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000039178 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000039178 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000039178 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000039178 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000194393 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| C000194393 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000194393 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.40% |
| C000194393 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| C000194393 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000194393 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000194393 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000194393 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000194393 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000224786 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| C000224786 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000224786 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.40% |
| C000224786 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| C000224786 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000224786 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000224786 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000224786 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000224786 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000017969 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000017969 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000017969 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.10% |
| C000017969 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000017969 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000017969 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000017969 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000017969 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000017969 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000189689 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000189689 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000189689 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.10% |
| C000189689 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000189689 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000189689 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000189689 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000189689 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000189689 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000189690 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000189690 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000189690 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.10% |
| C000189690 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000189690 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000189690 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000189690 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000189690 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000189690 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000017971 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000017971 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000017971 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.10% |
| C000017971 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000017971 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000017971 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000017971 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000017971 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000017971 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000017973 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000017973 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000017973 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.10% |
| C000017973 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000017973 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000017973 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000017973 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000017973 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000017973 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000017974 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000017974 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000017974 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.10% |
| C000017974 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000017974 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000017974 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000017974 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000017974 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000017974 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000017970 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000017970 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000017970 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.10% |
| C000017970 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000017970 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000017970 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000017970 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000017970 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000017970 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000131615 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000131615 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000131615 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.10% |
| C000131615 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000131615 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000131615 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000131615 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000131615 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000131615 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000194391 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000194391 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000194391 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.10% |
| C000194391 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000194391 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000194391 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000194391 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000194391 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000194391 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000144162 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.80% |
| C000144162 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000144162 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000144162 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000144162 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000144162 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000144162 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000144162 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000144162 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000144162 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| C000144162 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000189693 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.80% |
| C000189693 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000189693 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000189693 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000189693 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000189693 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000189693 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000189693 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000189693 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000189693 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| C000189693 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000189694 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.80% |
| C000189694 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000189694 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000189694 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000189694 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000189694 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000189694 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000189694 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000189694 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000189694 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| C000189694 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000144164 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.80% |
| C000144164 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000144164 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000144164 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000144164 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000144164 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000144164 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000144164 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000144164 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000144164 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| C000144164 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000144165 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.80% |
| C000144165 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000144165 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000144165 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000144165 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000144165 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000144165 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000144165 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000144165 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000144165 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| C000144165 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000144166 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.80% |
| C000144166 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000144166 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000144166 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000144166 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000144166 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000144166 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000144166 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000144166 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000144166 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| C000144166 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000144163 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.80% |
| C000144163 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000144163 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000144163 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000144163 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000144163 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000144163 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000144163 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000144163 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000144163 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| C000144163 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000144167 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.80% |
| C000144167 [Member] | Preferred Stock [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000144167 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000144167 [Member] | Collateralized Mortgage Obligations [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000144167 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000144167 [Member] | Commercial Mortgage-Backed Security [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000144167 [Member] | Collateralized Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000144167 [Member] | Sovereign Governments and Agencies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000144167 [Member] | Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000144167 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.30%) |
| C000144167 [Member] | Bank Loan Obligation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000017975 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| C000017975 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| C000017975 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000017975 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (7.50%) |
| C000017975 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| C000017975 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.80% |
| C000162988 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| C000162988 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| C000162988 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000162988 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (7.50%) |
| C000162988 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| C000162988 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.80% |
| C000162989 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| C000162989 [Member] | U.S. Treasury Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| C000162989 [Member] | Municipal Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000162989 [Member] | Other Assets and Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (7.50%) |
| C000162989 [Member] | U.S. Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| C000162989 [Member] | Repurchase Agreements [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.80% |
