| Form N-CSR Cover | 12 Months Ended |
| Oct. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | AMG Funds I |
| Entity Central Index Key | 0000882443 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Oct. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | AMG Funds I |
| Entity Central Index Key | 0000882443 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| C000027413 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG Veritas Global Focus Fund |
| Class Name | Class N |
| Trading Symbol | MFQAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG Veritas Global Focus Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG Veritas Global Focus Fund $ 1.13 % |
| Expenses Paid, Amount | $ 127 |
| Expense Ratio, Percent | 1.13% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance Performance Overview • Relative Performance • • • • Positioning and Outlook • |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted over a ten year period, as compared to the performance of a Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years 10 Years Class N 25.27 % 7.74 % 8.13 % MSCI World Index 33.68 % 12.03 % 9.78 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 32,420,249 |
| Holdings Count | Holding | 31 |
| Advisory Fees Paid, Amount | $ 109,693 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 31 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 42 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund and country allocation is shown as a percentage of total long-term investments of the Fund. Top Ten Holdings Amazon.com, Inc. (United States) 6.7 % Alphabet, Inc., Class A (United States) 6.3 % Diageo PLC (United Kingdom) 4.6 % Aon PLC, Class A (United States) 4.6 % UnitedHealth Group, Inc. (United States) 4.5 % Unilever PLC (United Kingdom) 4.3 % Airbus SE (France) 4.2 % Safran SA (France) 4.2 % Canadian Pacific Kansas City, Ltd. (Canada) 4.2 % Microsoft Corp. (United States) 4.0 % Top Ten as a Group 47.6 % Portfolio Breakdown Country Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Amazon.com, Inc. (United States) 6.7 % Alphabet, Inc., Class A (United States) 6.3 % Diageo PLC (United Kingdom) 4.6 % Aon PLC, Class A (United States) 4.6 % UnitedHealth Group, Inc. (United States) 4.5 % Unilever PLC (United Kingdom) 4.3 % Airbus SE (France) 4.2 % Safran SA (France) 4.2 % Canadian Pacific Kansas City, Ltd. (Canada) 4.2 % Microsoft Corp. (United States) 4.0 % Top Ten as a Group 47.6 % |
| C000027415 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG Veritas Global Focus Fund |
| Class Name | Class I |
| Trading Symbol | MFQTX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG Veritas Global Focus Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG Veritas Global Focus Fund $ 0.88 % |
| Expenses Paid, Amount | $ 99 |
| Expense Ratio, Percent | 0.88% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance Performance Overview • Relative Performance • • • • Positioning and Outlook • |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted over a ten year period, as compared to the performance of a Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years 10 Years Class I 25.58 % 8.00 % 8.39 % MSCI World Index 33.68 % 12.03 % 9.78 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 32,420,249 |
| Holdings Count | Holding | 31 |
| Advisory Fees Paid, Amount | $ 109,693 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 31 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 42 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund and country allocation is shown as a percentage of total long-term investments of the Fund. Top Ten Holdings Amazon.com, Inc. (United States) 6.7 % Alphabet, Inc., Class A (United States) 6.3 % Diageo PLC (United Kingdom) 4.6 % Aon PLC, Class A (United States) 4.6 % UnitedHealth Group, Inc. (United States) 4.5 % Unilever PLC (United Kingdom) 4.3 % Airbus SE (France) 4.2 % Safran SA (France) 4.2 % Canadian Pacific Kansas City, Ltd. (Canada) 4.2 % Microsoft Corp. (United States) 4.0 % Top Ten as a Group 47.6 % Portfolio Breakdown Country Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Amazon.com, Inc. (United States) 6.7 % Alphabet, Inc., Class A (United States) 6.3 % Diageo PLC (United Kingdom) 4.6 % Aon PLC, Class A (United States) 4.6 % UnitedHealth Group, Inc. (United States) 4.5 % Unilever PLC (United Kingdom) 4.3 % Airbus SE (France) 4.2 % Safran SA (France) 4.2 % Canadian Pacific Kansas City, Ltd. (Canada) 4.2 % Microsoft Corp. (United States) 4.0 % Top Ten as a Group 47.6 % |
| C000027420 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG River Road Large Cap Value Select Fund |
| Class Name | Class N |
| Trading Symbol | FQUAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG River Road Large Cap Value Select Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG River Road Large Cap Value Select Fund $ 0.95 % |
| Expenses Paid, Amount | $ 112 |
| Expense Ratio, Percent | 0.95% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance Performance Overview • ® Top Contributors and Detractors • • • • • Positioning • |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted over a ten year period, as compared to the performance of (i) a broad based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests. The performance table below shows the average annual total returns of the class of shares noted for the past one-, five-, and ten-year periods ended as of October 31, 2024. It also shows the average total returns of (i) a broad based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests over the same periods. Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years 10 Years Class N 36.62 % 9.97 % 9.15 % S&P 500 ® 38.02 % 15.27 % 13.00 % Russell 1000 ® 30.98 % 10.14 % 8.87 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 46,111,504 |
| Holdings Count | Holding | 28 |
| Advisory Fees Paid, Amount | $ 58,846 |
| Investment Company Portfolio Turnover | 106% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 28 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 106 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund. Top Ten Holdings CRH PLC 8.1 % BJ's Wholesale Club Holdings, Inc. 6.3 % Willis Towers Watson PLC (United Kingdom) 6.0 % Fairfax Financial Holdings, Ltd. (Canada) 5.7 % Lululemon Athletica, Inc. (Canada) 5.1 % The Kroger Co. 5.0 % Labcorp Holdings, Inc. 4.9 % Lennar Corp., Class A 4.6 % KKR & Co., Inc. 4.5 % Casey's General Stores, Inc. 4.3 % Top Ten as a Group 54.5 % Portfolio Breakdown |
| Largest Holdings [Text Block] | Top Ten Holdings CRH PLC 8.1 % BJ's Wholesale Club Holdings, Inc. 6.3 % Willis Towers Watson PLC (United Kingdom) 6.0 % Fairfax Financial Holdings, Ltd. (Canada) 5.7 % Lululemon Athletica, Inc. (Canada) 5.1 % The Kroger Co. 5.0 % Labcorp Holdings, Inc. 4.9 % Lennar Corp., Class A 4.6 % KKR & Co., Inc. 4.5 % Casey's General Stores, Inc. 4.3 % Top Ten as a Group 54.5 % |
| C000027422 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG River Road Large Cap Value Select Fund |
| Class Name | Class I |
| Trading Symbol | MEQFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG River Road Large Cap Value Select Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG River Road Large Cap Value Select Fund $ 0.63 % |
| Expenses Paid, Amount | $ 75 |
| Expense Ratio, Percent | 0.63% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance Performance Overview • ® Top Contributors and Detractors • • • • • Positioning • |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted over a ten year period, as compared to the performance of (i) a broad based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests. The performance table below shows the average annual total returns of the class of shares noted for the past one-, five-, and ten-year periods ended as of October 31, 2024. It also shows the average total returns of (i) a broad based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests over the same periods. Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years 10 Years Class I 37.06 % 10.32 % 9.47 % S&P 500 ® 38.02 % 15.27 % 13.00 % Russell 1000 ® 30.98 % 10.14 % 8.87 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 46,111,504 |
| Holdings Count | Holding | 28 |
| Advisory Fees Paid, Amount | $ 58,846 |
| Investment Company Portfolio Turnover | 106% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 28 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 106 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund. Top Ten Holdings CRH PLC 8.1 % BJ's Wholesale Club Holdings, Inc. 6.3 % Willis Towers Watson PLC (United Kingdom) 6.0 % Fairfax Financial Holdings, Ltd. (Canada) 5.7 % Lululemon Athletica, Inc. (Canada) 5.1 % The Kroger Co. 5.0 % Labcorp Holdings, Inc. 4.9 % Lennar Corp., Class A 4.6 % KKR & Co., Inc. 4.5 % Casey's General Stores, Inc. 4.3 % Top Ten as a Group 54.5 % Portfolio Breakdown |
| Largest Holdings [Text Block] | Top Ten Holdings CRH PLC 8.1 % BJ's Wholesale Club Holdings, Inc. 6.3 % Willis Towers Watson PLC (United Kingdom) 6.0 % Fairfax Financial Holdings, Ltd. (Canada) 5.7 % Lululemon Athletica, Inc. (Canada) 5.1 % The Kroger Co. 5.0 % Labcorp Holdings, Inc. 4.9 % Lennar Corp., Class A 4.6 % KKR & Co., Inc. 4.5 % Casey's General Stores, Inc. 4.3 % Top Ten as a Group 54.5 % |
| C000081949 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG Frontier Small Cap Growth Fund |
| Class Name | Class N |
| Trading Symbol | MSSVX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG Frontier Small Cap Growth Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG Frontier Small Cap Growth Fund $ 1.30 % |
| Expenses Paid, Amount | $ 152 |
| Expense Ratio, Percent | 1.30% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance PERFORMANCE OVERVIEW • ® ® • • TOP CONTRIBUTORS AND DETRACTORS • • • • ® |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted over a ten year period, as compared to the performance of (i) a broad based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests. The performance table below shows the average annual total returns of the class of shares noted for the past one-, five-, and ten-year periods ended as of October 31, 2024. It also shows the average total returns of (i) a broad based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests over the same periods. Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years 10 Years Class N 33.53 % 12.92 % 10.97 % S&P 500 ® 38.02 % 15.27 % 13.00 % Russell 2000 ® 36.49 % 7.92 % 8.15 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 78,712,660 |
| Holdings Count | Holding | 122 |
| Advisory Fees Paid, Amount | $ 347,097 |
| Investment Company Portfolio Turnover | 234% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 122 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 234 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund. Top Ten Holdings Summit Materials, Inc., Class A 4.1 % Eagle Materials, Inc. 3.8 % Lithia Motors, Inc. 3.8 % United Therapeutics Corp. 3.2 % Beacon Roofing Supply, Inc. 3.2 % Viking Therapeutics, Inc. 3.1 % Caesars Entertainment, Inc. 3.1 % Granite Construction, Inc. 3.1 % Credo Technology Group Holding, Ltd. 2.8 % ATI, Inc. 2.3 % Top Ten as a Group 32.5 % Portfolio Breakdown |
| Largest Holdings [Text Block] | Top Ten Holdings Summit Materials, Inc., Class A 4.1 % Eagle Materials, Inc. 3.8 % Lithia Motors, Inc. 3.8 % United Therapeutics Corp. 3.2 % Beacon Roofing Supply, Inc. 3.2 % Viking Therapeutics, Inc. 3.1 % Caesars Entertainment, Inc. 3.1 % Granite Construction, Inc. 3.1 % Credo Technology Group Holding, Ltd. 2.8 % ATI, Inc. 2.3 % Top Ten as a Group 32.5 % |
| C000027423 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG Frontier Small Cap Growth Fund |
| Class Name | Class I |
| Trading Symbol | MSSCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG Frontier Small Cap Growth Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG Frontier Small Cap Growth Fund $ 0.99 % |
| Expenses Paid, Amount | $ 116 |
| Expense Ratio, Percent | 0.99% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance PERFORMANCE OVERVIEW • ® ® • • TOP CONTRIBUTORS AND DETRACTORS • • • • ® |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted over a ten year period, as compared to the performance of (i) a broad based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests. The performance table below shows the average annual total returns of the class of shares noted for the past one-, five-, and ten-year periods ended as of October 31, 2024. It also shows the average total returns of (i) a broad based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests over the same periods. Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years 10 Years Class I 33.86 % 13.30 % 11.30 % S&P 500 ® 38.02 % 15.27 % 13.00 % Russell 2000 ® 36.49 % 7.92 % 8.15 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 78,712,660 |
| Holdings Count | Holding | 122 |
| Advisory Fees Paid, Amount | $ 347,097 |
| Investment Company Portfolio Turnover | 234% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 122 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 234 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund. Top Ten Holdings Summit Materials, Inc., Class A 4.1 % Eagle Materials, Inc. 3.8 % Lithia Motors, Inc. 3.8 % United Therapeutics Corp. 3.2 % Beacon Roofing Supply, Inc. 3.2 % Viking Therapeutics, Inc. 3.1 % Caesars Entertainment, Inc. 3.1 % Granite Construction, Inc. 3.1 % Credo Technology Group Holding, Ltd. 2.8 % ATI, Inc. 2.3 % Top Ten as a Group 32.5 % Portfolio Breakdown |
| Largest Holdings [Text Block] | Top Ten Holdings Summit Materials, Inc., Class A 4.1 % Eagle Materials, Inc. 3.8 % Lithia Motors, Inc. 3.8 % United Therapeutics Corp. 3.2 % Beacon Roofing Supply, Inc. 3.2 % Viking Therapeutics, Inc. 3.1 % Caesars Entertainment, Inc. 3.1 % Granite Construction, Inc. 3.1 % Credo Technology Group Holding, Ltd. 2.8 % ATI, Inc. 2.3 % Top Ten as a Group 32.5 % |
| C000081950 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG Frontier Small Cap Growth Fund |
| Class Name | Class Z |
| Trading Symbol | MSSYX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG Frontier Small Cap Growth Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG Frontier Small Cap Growth Fund $ 0.90 % |
| Expenses Paid, Amount | $ 105 |
| Expense Ratio, Percent | 0.90% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance PERFORMANCE OVERVIEW • ® ® • • TOP CONTRIBUTORS AND DETRACTORS • • • • ® |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted over a ten year period, as compared to the performance of (i) a broad based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests. The performance table below shows the average annual total returns of the class of shares noted for the past one-, five-, and ten-year periods ended as of October 31, 2024. It also shows the average total returns of (i) a broad based index and (ii) an additional index reflecting the market segment(s) in which the Fund invests over the same periods. Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years 10 Years Class Z 34.01 % 13.37 % 11.43 % S&P 500 ® 38.02 % 15.27 % 13.00 % Russell 2000 ® 36.49 % 7.92 % 8.15 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 78,712,660 |
| Holdings Count | Holding | 122 |
| Advisory Fees Paid, Amount | $ 347,097 |
| Investment Company Portfolio Turnover | 234% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 122 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 234 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund. Top Ten Holdings Summit Materials, Inc., Class A 4.1 % Eagle Materials, Inc. 3.8 % Lithia Motors, Inc. 3.8 % United Therapeutics Corp. 3.2 % Beacon Roofing Supply, Inc. 3.2 % Viking Therapeutics, Inc. 3.1 % Caesars Entertainment, Inc. 3.1 % Granite Construction, Inc. 3.1 % Credo Technology Group Holding, Ltd. 2.8 % ATI, Inc. 2.3 % Top Ten as a Group 32.5 % Portfolio Breakdown |
| Largest Holdings [Text Block] | Top Ten Holdings Summit Materials, Inc., Class A 4.1 % Eagle Materials, Inc. 3.8 % Lithia Motors, Inc. 3.8 % United Therapeutics Corp. 3.2 % Beacon Roofing Supply, Inc. 3.2 % Viking Therapeutics, Inc. 3.1 % Caesars Entertainment, Inc. 3.1 % Granite Construction, Inc. 3.1 % Credo Technology Group Holding, Ltd. 2.8 % ATI, Inc. 2.3 % Top Ten as a Group 32.5 % |
| C000027424 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG Veritas China Fund |
| Class Name | Class N |
| Trading Symbol | MMCFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG Veritas China Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG Veritas China Fund $ 1.15 % |
| Expenses Paid, Amount | $ 115 |
| Expense Ratio, Percent | 1.15% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance Performance Overview • • • Relative Performance • • Positioning and Outlook • • |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted over a ten year period, as compared to the performance of a Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years 10 Years Class N 0.36 % (4.95 % ) 2.02 % MSCI China Index 21.75 % (1.17 % ) 2.35 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 43,196,442 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 168,265 |
| Investment Company Portfolio Turnover | 100% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 36 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 100 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund and country allocation is shown as a percentage of total long-term investments of the Fund. Top Ten Holdings Tencent Holdings, Ltd. (China) 19.4 % Alibaba Group Holding, Ltd. (China) 9.5 % Zijin Mining Group Co., Ltd., Class H (China) 4.9 % NARI Technology Co., Ltd., Class A (China) 4.8 % Meituan, Class B (China) 4.4 % Contemporary Amperex Technology Co., Ltd., Class A (China) 4.0 % BYD Co., Ltd., Class A (China) 3.8 % PDD Holdings, Inc., ADR (China) 3.7 % NetEase, Inc. (China) 3.1 % Tsingtao Brewery Co., Ltd., Class H (China) 2.9 % Top Ten as a Group 60.5 % Portfolio Breakdown Country Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Tencent Holdings, Ltd. (China) 19.4 % Alibaba Group Holding, Ltd. (China) 9.5 % Zijin Mining Group Co., Ltd., Class H (China) 4.9 % NARI Technology Co., Ltd., Class A (China) 4.8 % Meituan, Class B (China) 4.4 % Contemporary Amperex Technology Co., Ltd., Class A (China) 4.0 % BYD Co., Ltd., Class A (China) 3.8 % PDD Holdings, Inc., ADR (China) 3.7 % NetEase, Inc. (China) 3.1 % Tsingtao Brewery Co., Ltd., Class H (China) 2.9 % Top Ten as a Group 60.5 % |
| C000105228 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG Veritas China Fund |
| Class Name | Class I |
| Trading Symbol | MIMFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG Veritas China Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG Veritas China Fund $ 0.94 % |
| Expenses Paid, Amount | $ 94 |
| Expense Ratio, Percent | 0.94% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance Performance Overview • • • Relative Performance • • Positioning and Outlook • • |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted over a ten year period, as compared to the performance of a Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years 10 Years Class I 0.53 % (4.74 % ) 2.26 % MSCI China Index 21.75 % (1.17 % ) 2.35 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 43,196,442 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 168,265 |
| Investment Company Portfolio Turnover | 100% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 36 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 100 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund and country allocation is shown as a percentage of total long-term investments of the Fund. Top Ten Holdings Tencent Holdings, Ltd. (China) 19.4 % Alibaba Group Holding, Ltd. (China) 9.5 % Zijin Mining Group Co., Ltd., Class H (China) 4.9 % NARI Technology Co., Ltd., Class A (China) 4.8 % Meituan, Class B (China) 4.4 % Contemporary Amperex Technology Co., Ltd., Class A (China) 4.0 % BYD Co., Ltd., Class A (China) 3.8 % PDD Holdings, Inc., ADR (China) 3.7 % NetEase, Inc. (China) 3.1 % Tsingtao Brewery Co., Ltd., Class H (China) 2.9 % Top Ten as a Group 60.5 % Portfolio Breakdown Country Allocation |
| Largest Holdings [Text Block] | Top Ten Holdings Tencent Holdings, Ltd. (China) 19.4 % Alibaba Group Holding, Ltd. (China) 9.5 % Zijin Mining Group Co., Ltd., Class H (China) 4.9 % NARI Technology Co., Ltd., Class A (China) 4.8 % Meituan, Class B (China) 4.4 % Contemporary Amperex Technology Co., Ltd., Class A (China) 4.0 % BYD Co., Ltd., Class A (China) 3.8 % PDD Holdings, Inc., ADR (China) 3.7 % NetEase, Inc. (China) 3.1 % Tsingtao Brewery Co., Ltd., Class H (China) 2.9 % Top Ten as a Group 60.5 % |
| C000158523 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG GW&K Core Bond ESG Fund |
| Class Name | Class N |
| Trading Symbol | MBGVX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG GW&K Core Bond ESG Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG GW&K Core Bond ESG Fund $ 0.88 % |
| Expenses Paid, Amount | $ 93 |
| Expense Ratio, Percent | 0.88% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance Performance Overview • • Top Contributors and Detractors • • • • Positioning Update • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted since the class's inception on May 08, 2015, as compared to the performance of a Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years Since Inception Class N 10.70 % (0.78 % ) 0.85 % Bloomberg U.S. Aggregate Bond Index 10.55 % (0.23 % ) 1.40 % |
| Performance Inception Date | May 08, 2015 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 118,779,576 |
| Holdings Count | Holding | 121 |
| Advisory Fees Paid, Amount | $ 194,655 |
| Investment Company Portfolio Turnover | 34% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 121 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 34 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund and ratings are shown as a percentage of total long-term investments of the Fund. Top Ten Holdings U.S. Treasury Bonds, 2.250%, 05/15/41 4.4 % U.S. Treasury Bonds, 3.125%, 05/15/48 2.9 % FHLMC, 3.500%, 10/01/45 2.4 % U.S. Treasury Bonds, 3.500%, 02/15/39 2.3 % FHLMC, 5.500%, 06/01/53 2.0 % FHLMC, 3.000%, 11/01/49 2.0 % U.S. Treasury Bonds, 1.875%, 02/15/51 1.8 % FNMA, 4.500%, 06/01/41 1.6 % FHLMC, 2.500%, 10/01/34 1.6 % California State General Obligation, School Improvements, Build America Bonds, 7.550%, 04/01/39 1.5 % Top Ten as a Group 22.5 % Portfolio Breakdown Ratings |
| Largest Holdings [Text Block] | Top Ten Holdings U.S. Treasury Bonds, 2.250%, 05/15/41 4.4 % U.S. Treasury Bonds, 3.125%, 05/15/48 2.9 % FHLMC, 3.500%, 10/01/45 2.4 % U.S. Treasury Bonds, 3.500%, 02/15/39 2.3 % FHLMC, 5.500%, 06/01/53 2.0 % FHLMC, 3.000%, 11/01/49 2.0 % U.S. Treasury Bonds, 1.875%, 02/15/51 1.8 % FNMA, 4.500%, 06/01/41 1.6 % FHLMC, 2.500%, 10/01/34 1.6 % California State General Obligation, School Improvements, Build America Bonds, 7.550%, 04/01/39 1.5 % Top Ten as a Group 22.5 % |
| C000027427 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG GW&K Core Bond ESG Fund |
| Class Name | Class I |
| Trading Symbol | MBDFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG GW&K Core Bond ESG Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG GW&K Core Bond ESG Fund $ 0.55 % |
| Expenses Paid, Amount | $ 58 |
| Expense Ratio, Percent | 0.55% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance Performance Overview • • Top Contributors and Detractors • • • • Positioning Update • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted over a ten year period, as compared to the performance of a Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years 10 Years Class I 11.06 % (0.46 % ) 1.25 % Bloomberg U.S. Aggregate Bond Index 10.55 % (0.23 % ) 1.49 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 118,779,576 |
| Holdings Count | Holding | 121 |
| Advisory Fees Paid, Amount | $ 194,655 |
| Investment Company Portfolio Turnover | 34% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 121 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 34 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund and ratings are shown as a percentage of total long-term investments of the Fund. Top Ten Holdings U.S. Treasury Bonds, 2.250%, 05/15/41 4.4 % U.S. Treasury Bonds, 3.125%, 05/15/48 2.9 % FHLMC, 3.500%, 10/01/45 2.4 % U.S. Treasury Bonds, 3.500%, 02/15/39 2.3 % FHLMC, 5.500%, 06/01/53 2.0 % FHLMC, 3.000%, 11/01/49 2.0 % U.S. Treasury Bonds, 1.875%, 02/15/51 1.8 % FNMA, 4.500%, 06/01/41 1.6 % FHLMC, 2.500%, 10/01/34 1.6 % California State General Obligation, School Improvements, Build America Bonds, 7.550%, 04/01/39 1.5 % Top Ten as a Group 22.5 % Portfolio Breakdown Ratings |
| Largest Holdings [Text Block] | Top Ten Holdings U.S. Treasury Bonds, 2.250%, 05/15/41 4.4 % U.S. Treasury Bonds, 3.125%, 05/15/48 2.9 % FHLMC, 3.500%, 10/01/45 2.4 % U.S. Treasury Bonds, 3.500%, 02/15/39 2.3 % FHLMC, 5.500%, 06/01/53 2.0 % FHLMC, 3.000%, 11/01/49 2.0 % U.S. Treasury Bonds, 1.875%, 02/15/51 1.8 % FNMA, 4.500%, 06/01/41 1.6 % FHLMC, 2.500%, 10/01/34 1.6 % California State General Obligation, School Improvements, Build America Bonds, 7.550%, 04/01/39 1.5 % Top Ten as a Group 22.5 % |
| C000158522 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | AMG GW&K Core Bond ESG Fund |
| Class Name | Class Z |
| Trading Symbol | MBDLX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AMG GW&K Core Bond ESG Fund (the “Fund”) for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://wealth.amg.com/resources/order-literature |
| Additional Information Phone Number | 800.548.4539 |
| Additional Information Website | https://wealth.amg.com/resources/order-literature |
| Expenses [Text Block] | Fund Expenses What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment AMG GW&K Core Bond ESG Fund $ 0.48 % |
| Expenses Paid, Amount | $ 51 |
| Expense Ratio, Percent | 0.48% |
| Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance Performance Overview • • Top Contributors and Detractors • • • • Positioning Update • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. |
| Line Graph [Table Text Block] | Fund Performance The performance line graph below shows the performance of a hypothetical $10,000 investment in the class of shares noted since the class's inception on May 08, 2015, as compared to the performance of a Performance for other share classes will vary. The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 Years Since Inception Class Z 11.15 % (0.39 % ) 1.26 % Bloomberg U.S. Aggregate Bond Index 10.55 % (0.23 % ) 1.40 % |
| Performance Inception Date | May 08, 2015 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | For updated Fund performance information, please visit: https://wealth.amg.com/ |
| Net Assets | $ 118,779,576 |
| Holdings Count | Holding | 121 |
| Advisory Fees Paid, Amount | $ 194,655 |
| Investment Company Portfolio Turnover | 34% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of Fund net assets $ Total number of portfolio holdings 121 Net advisory fees paid $ Portfolio turnover rate as of the end of the reporting period 34 % |
| Holdings [Text Block] | Graphical Representation of Holdings (as of October 31, 2024) Top ten holdings and portfolio breakdown are shown as a percentage of net assets of the Fund and ratings are shown as a percentage of total long-term investments of the Fund. Top Ten Holdings U.S. Treasury Bonds, 2.250%, 05/15/41 4.4 % U.S. Treasury Bonds, 3.125%, 05/15/48 2.9 % FHLMC, 3.500%, 10/01/45 2.4 % U.S. Treasury Bonds, 3.500%, 02/15/39 2.3 % FHLMC, 5.500%, 06/01/53 2.0 % FHLMC, 3.000%, 11/01/49 2.0 % U.S. Treasury Bonds, 1.875%, 02/15/51 1.8 % FNMA, 4.500%, 06/01/41 1.6 % FHLMC, 2.500%, 10/01/34 1.6 % California State General Obligation, School Improvements, Build America Bonds, 7.550%, 04/01/39 1.5 % Top Ten as a Group 22.5 % Portfolio Breakdown Ratings |
| Largest Holdings [Text Block] | Top Ten Holdings U.S. Treasury Bonds, 2.250%, 05/15/41 4.4 % U.S. Treasury Bonds, 3.125%, 05/15/48 2.9 % FHLMC, 3.500%, 10/01/45 2.4 % U.S. Treasury Bonds, 3.500%, 02/15/39 2.3 % FHLMC, 5.500%, 06/01/53 2.0 % FHLMC, 3.000%, 11/01/49 2.0 % U.S. Treasury Bonds, 1.875%, 02/15/51 1.8 % FNMA, 4.500%, 06/01/41 1.6 % FHLMC, 2.500%, 10/01/34 1.6 % California State General Obligation, School Improvements, Build America Bonds, 7.550%, 04/01/39 1.5 % Top Ten as a Group 22.5 % |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 60 Months Ended | 114 Months Ended | 120 Months Ended | |||||||||||
| Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015 | May 08, 2015 | Oct. 31, 2014 | |
| C000027413 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class N | ||||||||||||||
| Account Value | $ 21,846 | $ 21,846 | $ 21,846 | $ 21,846 | $ 17,440 | $ 15,719 | $ 20,284 | $ 14,966 | $ 15,047 | $ 13,661 | $ 12,786 | $ 10,289 | $ 10,379 | $ 10,000 | |
| Average Annual Return, Percent | 25.27% | 7.74% | 8.13% | ||||||||||||
| C000027415 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||||||
| Account Value | $ 22,385 | $ 22,385 | 22,385 | $ 22,385 | 17,828 | 16,026 | 20,640 | 15,193 | 15,235 | 13,800 | 12,882 | 10,342 | 10,403 | 10,000 | |
| Average Annual Return, Percent | 25.58% | 8% | 8.39% | ||||||||||||
| C000027420 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class N | ||||||||||||||
| Account Value | $ 23,999 | $ 23,999 | 23,999 | $ 23,999 | 17,565 | 16,040 | 17,601 | 13,181 | 14,920 | 13,924 | 12,373 | 10,090 | 10,190 | 10,000 | |
| Average Annual Return, Percent | 36.62% | 9.97% | 9.15% | ||||||||||||
| C000027422 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||||||
| Account Value | $ 24,731 | $ 24,731 | 24,731 | $ 24,731 | 18,039 | 16,425 | 17,961 | 13,410 | 15,132 | 14,085 | 12,485 | 10,141 | 10,216 | 10,000 | |
| Average Annual Return, Percent | 37.06% | 10.32% | 9.47% | ||||||||||||
| C000081949 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class N | ||||||||||||||
| Account Value | $ 28,310 | $ 28,310 | 28,310 | $ 28,310 | 21,202 | 21,331 | 27,409 | 17,924 | 15,422 | 13,791 | 12,118 | 9,407 | 9,698 | 10,000 | |
| Average Annual Return, Percent | 33.53% | 12.92% | 10.97% | ||||||||||||
| C000027423 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||||||
| Account Value | $ 29,174 | $ 29,174 | 29,174 | $ 29,174 | 21,797 | 21,858 | 27,994 | 18,237 | 15,630 | 13,945 | 12,219 | 9,456 | 9,726 | 10,000 | |
| Average Annual Return, Percent | 33.86% | 13.30% | 11.30% | ||||||||||||
| C000081950 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class Z | ||||||||||||||
| Account Value | $ 29,517 | $ 29,517 | 29,517 | $ 29,517 | 22,026 | 22,083 | 28,263 | 18,398 | 15,759 | 14,052 | 12,298 | 9,502 | 9,749 | 10,000 | |
| Average Annual Return, Percent | 34.01% | 13.37% | 11.43% | ||||||||||||
| C000027424 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class N | ||||||||||||||
| Account Value | $ 12,215 | $ 12,215 | 12,215 | $ 12,215 | 12,172 | 12,054 | 20,354 | 15,608 | 15,744 | 14,651 | 13,463 | 9,941 | 9,699 | 10,000 | |
| Average Annual Return, Percent | 0.36% | (4.95%) | 2.02% | ||||||||||||
| C000105228 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||||||
| Account Value | $ 12,500 | $ 12,500 | 12,500 | $ 12,500 | 12,437 | 12,290 | 20,712 | 15,841 | 15,940 | 14,797 | 13,564 | 9,989 | 9,724 | 10,000 | |
| Average Annual Return, Percent | 0.53% | (4.74%) | 2.26% | ||||||||||||
| C000158523 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class N | ||||||||||||||
| Account Value | $ 10,831 | $ 10,831 | $ 10,831 | $ 10,831 | 9,786 | 9,801 | 11,834 | 11,865 | 11,267 | 10,132 | 10,423 | 10,364 | 9,924 | $ 10,000 | |
| Average Annual Return, Percent | 10.70% | (0.78%) | 0.85% | ||||||||||||
| C000027427 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||||||
| Account Value | $ 11,321 | $ 11,321 | $ 11,321 | $ 11,321 | 10,195 | 10,165 | 12,245 | 12,228 | 11,585 | 10,371 | 10,646 | 10,550 | 10,068 | 10,000 | |
| Average Annual Return, Percent | 11.06% | (0.46%) | 1.25% | ||||||||||||
| C000158522 [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class Z | ||||||||||||||
| Account Value | $ 11,257 | $ 11,257 | $ 11,257 | $ 11,257 | 10,127 | 10,102 | 12,148 | 12,132 | 11,475 | 10,273 | 10,527 | 10,425 | 9,943 | 10,000 | |
| Average Annual Return, Percent | 11.15% | (0.39%) | 1.26% | ||||||||||||
| MSCI World Index [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index | ||||||||||||||
| Account Value | $ 25,429 | $ 25,429 | $ 25,429 | $ 25,429 | 19,024 | 17,219 | 21,122 | 15,042 | 14,413 | 12,789 | 12,643 | 10,298 | 10,177 | 10,000 | |
| Average Annual Return, Percent | 33.68% | 12.03% | 9.78% | ||||||||||||
| Standard & Poor's 500 Index [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Index | ||||||||||||||
| Account Value | $ 33,949 | $ 33,949 | 33,949 | $ 33,949 | 24,599 | 22,334 | 26,155 | 18,301 | 16,681 | 14,591 | 13,593 | 10,994 | 10,520 | 10,000 | |
| Average Annual Return, Percent | 38.02% | 15.27% | 13% | ||||||||||||
| MSCI China Index [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | MSCI China Index | ||||||||||||||
| Account Value | $ 12,609 | $ 12,609 | 12,609 | $ 12,609 | 10,357 | 8,551 | 16,413 | 18,078 | 13,372 | 11,844 | 14,223 | 10,084 | 9,930 | 10,000 | |
| Average Annual Return, Percent | 21.75% | (1.17%) | 2.35% | ||||||||||||
| Bloomberg U S Aggregate Bond Index [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | ||||||||||||||
| Account Value | $ 11,406 | $ 11,406 | $ 11,406 | $ 11,406 | 10,318 | 10,282 | 12,194 | 12,252 | 11,538 | 10,348 | 10,564 | 10,470 | 10,032 | $ 10,000 | 10,000 |
| Average Annual Return, Percent | 10.55% | (0.23%) | 1.40% | 1.49% | |||||||||||
| Russell 1000 Value Index [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Russell 1000® Value Index | ||||||||||||||
| Account Value | $ 23,390 | $ 23,390 | $ 23,390 | $ 23,390 | 17,860 | 17,836 | 19,178 | 13,340 | 14,432 | 12,977 | 12,595 | 10,693 | 10,053 | 10,000 | |
| Average Annual Return, Percent | 30.98% | 10.14% | 8.87% | ||||||||||||
| Russell 2000 Growth Index [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Russell 2000® Growth Index | ||||||||||||||
| Account Value | $ 21,887 | $ 21,887 | $ 21,887 | $ 21,887 | $ 16,037 | $ 17,362 | $ 23,469 | $ 16,951 | $ 14,952 | $ 14,053 | $ 13,495 | $ 10,302 | $ 10,352 | $ 10,000 | |
| Average Annual Return, Percent | 36.49% | 7.92% | 8.15% |
| Shareholder Report, Holdings (Details) | Oct. 31, 2024 |
| C000027413 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.60% |
| C000027413 [Member] | Amazon com Inc United States [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| C000027413 [Member] | Alphabet Inc Class A United States [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000027413 [Member] | Diageo PLC United Kingdom [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000027413 [Member] | Aon PLC Class A United States [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000027413 [Member] | UnitedHealth Group Inc United States [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000027413 [Member] | Unilever PLC United Kingdom [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000027413 [Member] | Airbus SE France [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000027413 [Member] | Safran SA France [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000027413 [Member] | Canadian Pacific Kansas City Ltd Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000027413 [Member] | Microsoft Corp United States [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000027413 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000027413 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.80% |
| C000027413 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.40% |
| C000027413 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| C000027413 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| C000027413 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000027413 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000027413 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.70% |
| C000027413 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.60% |
| C000027413 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000027413 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.80% |
| C000027413 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000027413 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000027413 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000027413 [Member] | AUSTRALIA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000027413 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000027413 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.40%) |
| C000027415 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.60% |
| C000027415 [Member] | Amazon com Inc United States [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| C000027415 [Member] | Alphabet Inc Class A United States [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000027415 [Member] | Diageo PLC United Kingdom [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000027415 [Member] | Aon PLC Class A United States [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000027415 [Member] | UnitedHealth Group Inc United States [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000027415 [Member] | Unilever PLC United Kingdom [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000027415 [Member] | Airbus SE France [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000027415 [Member] | Safran SA France [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000027415 [Member] | Canadian Pacific Kansas City Ltd Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000027415 [Member] | Microsoft Corp United States [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000027415 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000027415 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.80% |
| C000027415 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.40% |
| C000027415 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| C000027415 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| C000027415 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000027415 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000027415 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.70% |
| C000027415 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.60% |
| C000027415 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000027415 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.80% |
| C000027415 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000027415 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000027415 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000027415 [Member] | AUSTRALIA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000027415 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000027415 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.40%) |
| C000027420 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.50% |
| C000027420 [Member] | CRH PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| C000027420 [Member] | BJ s Wholesale Club Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000027420 [Member] | Willis Towers Watson PLC United Kingdom [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| C000027420 [Member] | Fairfax Financial Holdings Ltd Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| C000027420 [Member] | Lululemon Athletica Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000027420 [Member] | The Kroger Co [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000027420 [Member] | Labcorp Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000027420 [Member] | Lennar Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000027420 [Member] | KKR And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000027420 [Member] | Casey s General Stores Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000027420 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000027420 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| C000027420 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.10% |
| C000027420 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| C000027420 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000027420 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| C000027420 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| C000027420 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000027420 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000027420 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000027420 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000027420 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.00%) |
| C000027422 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.50% |
| C000027422 [Member] | CRH PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| C000027422 [Member] | BJ s Wholesale Club Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000027422 [Member] | Willis Towers Watson PLC United Kingdom [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| C000027422 [Member] | Fairfax Financial Holdings Ltd Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| C000027422 [Member] | Lululemon Athletica Inc Canada [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000027422 [Member] | The Kroger Co [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000027422 [Member] | Labcorp Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000027422 [Member] | Lennar Corp Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000027422 [Member] | KKR And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000027422 [Member] | Casey s General Stores Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000027422 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000027422 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| C000027422 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.10% |
| C000027422 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| C000027422 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000027422 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| C000027422 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| C000027422 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000027422 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000027422 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000027422 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000027422 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.00%) |
| C000081949 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.50% |
| C000081949 [Member] | Summit Materials Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000081949 [Member] | Eagle Materials Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000081949 [Member] | Lithia Motors Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000081949 [Member] | United Therapeutics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000081949 [Member] | Beacon Roofing Supply Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000081949 [Member] | Viking Therapeutics Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000081949 [Member] | Caesars Entertainment Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000081949 [Member] | Granite Construction Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000081949 [Member] | Credo Technology Group Holding Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000081949 [Member] | ATI Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000081949 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000081949 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17% |
| C000081949 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| C000081949 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000081949 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000081949 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| C000081949 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000081949 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.50% |
| C000081949 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000081949 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000081949 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000081949 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.70%) |
| C000027423 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.50% |
| C000027423 [Member] | Summit Materials Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000027423 [Member] | Eagle Materials Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000027423 [Member] | Lithia Motors Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000027423 [Member] | United Therapeutics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000027423 [Member] | Beacon Roofing Supply Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000027423 [Member] | Viking Therapeutics Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000027423 [Member] | Caesars Entertainment Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000027423 [Member] | Granite Construction Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000027423 [Member] | Credo Technology Group Holding Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000027423 [Member] | ATI Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000027423 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000027423 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17% |
| C000027423 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| C000027423 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000027423 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000027423 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| C000027423 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000027423 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.50% |
| C000027423 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000027423 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000027423 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000027423 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.70%) |
| C000081950 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.50% |
| C000081950 [Member] | Summit Materials Inc Class A [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000081950 [Member] | Eagle Materials Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000081950 [Member] | Lithia Motors Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000081950 [Member] | United Therapeutics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000081950 [Member] | Beacon Roofing Supply Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000081950 [Member] | Viking Therapeutics Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000081950 [Member] | Caesars Entertainment Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000081950 [Member] | Granite Construction Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000081950 [Member] | Credo Technology Group Holding Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000081950 [Member] | ATI Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000081950 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.90% |
| C000081950 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17% |
| C000081950 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| C000081950 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000081950 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000081950 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| C000081950 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000081950 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.50% |
| C000081950 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000081950 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000081950 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000081950 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (1.70%) |
| C000027424 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.50% |
| C000027424 [Member] | Tencent Holdings Ltd China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.40% |
| C000027424 [Member] | Alibaba Group Holding Ltd China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| C000027424 [Member] | Zijin Mining Group Co Ltd Class H China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000027424 [Member] | NARI Technology Co Ltd Class A China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000027424 [Member] | Meituan Class B China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000027424 [Member] | Contemporary Amperex Technology Co Ltd Class A China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000027424 [Member] | BYD Co Ltd Class A China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000027424 [Member] | PDD Holdings Inc ADR China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000027424 [Member] | NetEase Inc China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000027424 [Member] | Tsingtao Brewery Co Ltd Class H China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000027424 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.90% |
| C000027424 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000027424 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.80% |
| C000027424 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000027424 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| C000027424 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000027424 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000027424 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000027424 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000027424 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000027424 [Member] | CHINA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 92.30% |
| C000027424 [Member] | HONG KONG | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.10% |
| C000027424 [Member] | MACAO | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000027424 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000105228 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.50% |
| C000105228 [Member] | Tencent Holdings Ltd China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.40% |
| C000105228 [Member] | Alibaba Group Holding Ltd China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| C000105228 [Member] | Zijin Mining Group Co Ltd Class H China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000105228 [Member] | NARI Technology Co Ltd Class A China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000105228 [Member] | Meituan Class B China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000105228 [Member] | Contemporary Amperex Technology Co Ltd Class A China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000105228 [Member] | BYD Co Ltd Class A China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000105228 [Member] | PDD Holdings Inc ADR China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000105228 [Member] | NetEase Inc China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000105228 [Member] | Tsingtao Brewery Co Ltd Class H China [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000105228 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.90% |
| C000105228 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000105228 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.80% |
| C000105228 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000105228 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| C000105228 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000105228 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000105228 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000105228 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000105228 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000105228 [Member] | CHINA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 92.30% |
| C000105228 [Member] | HONG KONG | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.10% |
| C000105228 [Member] | MACAO | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000105228 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000158523 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.50% |
| C000158523 [Member] | U S Treasury Bonds 2 250 05 15 41 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000158523 [Member] | U S Treasury Bonds 3 125 05 15 48 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000158523 [Member] | FHLMC 3 500 10 01 45 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000158523 [Member] | U S Treasury Bonds 3 500 02 15 39 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000158523 [Member] | FHLMC 5 500 06 01 53 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000158523 [Member] | FHLMC 3 000 11 01 49 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000158523 [Member] | U S Treasury Bonds 1 875 02 15 51 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000158523 [Member] | FNMA 4 500 06 01 41 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000158523 [Member] | FHLMC 2 500 10 01 34 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000158523 [Member] | California State General Obligation School Improvements Build America Bonds 7 550 04 01 39 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000158523 [Member] | US Government Corporations and Agencies Securities Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 50.50% |
| C000158523 [Member] | Aaa AAA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000158523 [Member] | Aa AA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000158523 [Member] | A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000158523 [Member] | Baa BBB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000158523 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000158523 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.20%) |
| C000158523 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.10% |
| C000158523 [Member] | Corporate Bonds and Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.50% |
| C000158523 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000158523 [Member] | Municipal Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000158523 [Member] | Collateralized Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000027427 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.50% |
| C000027427 [Member] | U S Treasury Bonds 2 250 05 15 41 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000027427 [Member] | U S Treasury Bonds 3 125 05 15 48 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000027427 [Member] | FHLMC 3 500 10 01 45 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000027427 [Member] | U S Treasury Bonds 3 500 02 15 39 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000027427 [Member] | FHLMC 5 500 06 01 53 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000027427 [Member] | FHLMC 3 000 11 01 49 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000027427 [Member] | U S Treasury Bonds 1 875 02 15 51 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000027427 [Member] | FNMA 4 500 06 01 41 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000027427 [Member] | FHLMC 2 500 10 01 34 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000027427 [Member] | California State General Obligation School Improvements Build America Bonds 7 550 04 01 39 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000027427 [Member] | US Government Corporations and Agencies Securities Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 50.50% |
| C000027427 [Member] | Aaa AAA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000027427 [Member] | Aa AA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000027427 [Member] | A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000027427 [Member] | Baa BBB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000027427 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000027427 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.20%) |
| C000027427 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.10% |
| C000027427 [Member] | Corporate Bonds and Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.50% |
| C000027427 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000027427 [Member] | Municipal Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000027427 [Member] | Collateralized Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000158522 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.50% |
| C000158522 [Member] | U S Treasury Bonds 2 250 05 15 41 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000158522 [Member] | U S Treasury Bonds 3 125 05 15 48 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000158522 [Member] | FHLMC 3 500 10 01 45 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000158522 [Member] | U S Treasury Bonds 3 500 02 15 39 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000158522 [Member] | FHLMC 5 500 06 01 53 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000158522 [Member] | FHLMC 3 000 11 01 49 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000158522 [Member] | U S Treasury Bonds 1 875 02 15 51 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000158522 [Member] | FNMA 4 500 06 01 41 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000158522 [Member] | FHLMC 2 500 10 01 34 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000158522 [Member] | California State General Obligation School Improvements Build America Bonds 7 550 04 01 39 [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000158522 [Member] | US Government Corporations and Agencies Securities Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 50.50% |
| C000158522 [Member] | Aaa AAA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000158522 [Member] | Aa AA [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000158522 [Member] | A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000158522 [Member] | Baa BBB [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000158522 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000158522 [Member] | Other Assets less Liabilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.20%) |
| C000158522 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.10% |
| C000158522 [Member] | Corporate Bonds and Notes [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.50% |
| C000158522 [Member] | Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000158522 [Member] | Municipal Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000158522 [Member] | Collateralized Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
