| Form N-CSR Cover | 12 Months Ended |
| Aug. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | MFS SERIES TRUST I |
| Entity Central Index Key | 0000798244 |
| Document Period End Date | Aug. 31, 2024 |
| Shareholder Report | 12 Months Ended | |
| Aug. 31, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSR | |
| Amendment Flag | false | |
| Registrant Name | MFS SERIES TRUST I | |
| Entity Central Index Key | 0000798244 | |
| Document Period End Date | Aug. 31, 2024 | |
| C000132013 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Equity Fund | |
| Class Name | Class A | |
| Trading Symbol | MLVAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A $ 0.89 % | |
| Expenses Paid, Amount | $ 99 | |
| Expense Ratio, Percent | 0.89% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class A shares of the MFS Low Volatility Equity Fund (fund) provided a total return of 23.16%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s 500 Stock Index: A combination of the fund's security selection and an underweight position in the consumer discretionary sector contributed to relative performance. An underweight position in the energy sector also helped relative results. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Weak stock selection and an underweight position in the information technology sector held back relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class A over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr A without sales charge 23.16 % 11.20 % 11.11 % A with initial sales charge (5.75%) 16.08 % 9.89 % 10.45 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/a | |
| Net Assets | $ 428,880,651 | |
| Holdings Count | Holding | 100 | |
| Advisory Fees Paid, Amount | $ 2,111,409 | [1] |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 428,880,651 Total Management Fee ($)#: 2,111,409 Total Number of Holdings: 100 Portfolio Turnover Rate (%): 25 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.8 % Money Market Funds 0.2 % Equity sectors Information Technology 23.3 % Health Care 17.1 % Financials 14.3 % Industrials 12.3 % Consumer Staples 9.7 % Utilities 6.5 % Consumer Discretionary 6.5 % Communication Services 4.5 % Real Estate 3.5 % Materials 1.7 % Energy 0.4 % Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % | |
| C000132014 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Equity Fund | |
| Class Name | Class B | |
| Trading Symbol | MLVBX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment B $ 1.64 % | |
| Expenses Paid, Amount | $ 182 | |
| Expense Ratio, Percent | 1.64% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class B shares of the MFS Low Volatility Equity Fund (fund) provided a total return of 22.19%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s 500 Stock Index: A combination of the fund's security selection and an underweight position in the consumer discretionary sector contributed to relative performance. An underweight position in the energy sector also helped relative results. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Weak stock selection and an underweight position in the information technology sector held back relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class B over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr B without sales charge 22.19 % 10.35 % 10.27 % B with CDSC (declining over six years from 4% to 0%) × 18.19 % 10.08 % 10.27 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/b | |
| Net Assets | $ 428,880,651 | |
| Holdings Count | Holding | 100 | |
| Advisory Fees Paid, Amount | $ 2,111,409 | [2] |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 428,880,651 Total Management Fee ($)#: 2,111,409 Total Number of Holdings: 100 Portfolio Turnover Rate (%): 25 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.8 % Money Market Funds 0.2 % Equity sectors Information Technology 23.3 % Health Care 17.1 % Financials 14.3 % Industrials 12.3 % Consumer Staples 9.7 % Utilities 6.5 % Consumer Discretionary 6.5 % Communication Services 4.5 % Real Estate 3.5 % Materials 1.7 % Energy 0.4 % Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % | |
| C000132015 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Equity Fund | |
| Class Name | Class C | |
| Trading Symbol | MLVGX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C $ 1.64 % | |
| Expenses Paid, Amount | $ 182 | |
| Expense Ratio, Percent | 1.64% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class C shares of the MFS Low Volatility Equity Fund (fund) provided a total return of 22.24%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s 500 Stock Index: A combination of the fund's security selection and an underweight position in the consumer discretionary sector contributed to relative performance. An underweight position in the energy sector also helped relative results. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Weak stock selection and an underweight position in the information technology sector held back relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class C over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr C without sales charge 22.24 % 10.36 % 10.27 % C with CDSC (1% for 12 months) × 21.24 % 10.36 % 10.27 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/c | |
| Net Assets | $ 428,880,651 | |
| Holdings Count | Holding | 100 | |
| Advisory Fees Paid, Amount | $ 2,111,409 | [3] |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 428,880,651 Total Management Fee ($)#: 2,111,409 Total Number of Holdings: 100 Portfolio Turnover Rate (%): 25 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.8 % Money Market Funds 0.2 % Equity sectors Information Technology 23.3 % Health Care 17.1 % Financials 14.3 % Industrials 12.3 % Consumer Staples 9.7 % Utilities 6.5 % Consumer Discretionary 6.5 % Communication Services 4.5 % Real Estate 3.5 % Materials 1.7 % Energy 0.4 % Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % | |
| C000132016 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Equity Fund | |
| Class Name | Class I | |
| Trading Symbol | MLVHX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I $ 0.64 % | |
| Expenses Paid, Amount | $ 71 | |
| Expense Ratio, Percent | 0.64% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class I shares of the MFS Low Volatility Equity Fund (fund) provided a total return of 23.41%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s 500 Stock Index: A combination of the fund's security selection and an underweight position in the consumer discretionary sector contributed to relative performance. An underweight position in the energy sector also helped relative results. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Weak stock selection and an underweight position in the information technology sector held back relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class I over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr I without sales charge 23.41 % 11.46 % 11.37 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/i | |
| Net Assets | $ 428,880,651 | |
| Holdings Count | Holding | 100 | |
| Advisory Fees Paid, Amount | $ 2,111,409 | [4] |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 428,880,651 Total Management Fee ($)#: 2,111,409 Total Number of Holdings: 100 Portfolio Turnover Rate (%): 25 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.8 % Money Market Funds 0.2 % Equity sectors Information Technology 23.3 % Health Care 17.1 % Financials 14.3 % Industrials 12.3 % Consumer Staples 9.7 % Utilities 6.5 % Consumer Discretionary 6.5 % Communication Services 4.5 % Real Estate 3.5 % Materials 1.7 % Energy 0.4 % Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % | |
| C000132017 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Equity Fund | |
| Class Name | Class R1 | |
| Trading Symbol | MLVMX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R1 $ 1.64 % | |
| Expenses Paid, Amount | $ 182 | |
| Expense Ratio, Percent | 1.64% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R1 shares of the MFS Low Volatility Equity Fund (fund) provided a total return of 22.19%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s 500 Stock Index: A combination of the fund's security selection and an underweight position in the consumer discretionary sector contributed to relative performance. An underweight position in the energy sector also helped relative results. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Weak stock selection and an underweight position in the information technology sector held back relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R1 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R1 without sales charge 22.19 % 10.36 % 10.27 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r1 | |
| Net Assets | $ 428,880,651 | |
| Holdings Count | Holding | 100 | |
| Advisory Fees Paid, Amount | $ 2,111,409 | [5] |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 428,880,651 Total Management Fee ($)#: 2,111,409 Total Number of Holdings: 100 Portfolio Turnover Rate (%): 25 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.8 % Money Market Funds 0.2 % Equity sectors Information Technology 23.3 % Health Care 17.1 % Financials 14.3 % Industrials 12.3 % Consumer Staples 9.7 % Utilities 6.5 % Consumer Discretionary 6.5 % Communication Services 4.5 % Real Estate 3.5 % Materials 1.7 % Energy 0.4 % Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % | |
| C000132018 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Equity Fund | |
| Class Name | Class R2 | |
| Trading Symbol | MLVOX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R2 $ 1.14 % | |
| Expenses Paid, Amount | $ 127 | |
| Expense Ratio, Percent | 1.14% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R2 shares of the MFS Low Volatility Equity Fund (fund) provided a total return of 22.88%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s 500 Stock Index: A combination of the fund's security selection and an underweight position in the consumer discretionary sector contributed to relative performance. An underweight position in the energy sector also helped relative results. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Weak stock selection and an underweight position in the information technology sector held back relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R2 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R2 without sales charge 22.88 % 10.91 % 10.83 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r2 | |
| Net Assets | $ 428,880,651 | |
| Holdings Count | Holding | 100 | |
| Advisory Fees Paid, Amount | $ 2,111,409 | [6] |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 428,880,651 Total Management Fee ($)#: 2,111,409 Total Number of Holdings: 100 Portfolio Turnover Rate (%): 25 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.8 % Money Market Funds 0.2 % Equity sectors Information Technology 23.3 % Health Care 17.1 % Financials 14.3 % Industrials 12.3 % Consumer Staples 9.7 % Utilities 6.5 % Consumer Discretionary 6.5 % Communication Services 4.5 % Real Estate 3.5 % Materials 1.7 % Energy 0.4 % Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % | |
| C000132019 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Equity Fund | |
| Class Name | Class R3 | |
| Trading Symbol | MLVPX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R3 $ 0.89 % | |
| Expenses Paid, Amount | $ 99 | |
| Expense Ratio, Percent | 0.89% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R3 shares of the MFS Low Volatility Equity Fund (fund) provided a total return of 23.11%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s 500 Stock Index: A combination of the fund's security selection and an underweight position in the consumer discretionary sector contributed to relative performance. An underweight position in the energy sector also helped relative results. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Weak stock selection and an underweight position in the information technology sector held back relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R3 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R3 without sales charge 23.11 % 11.20 % 11.11 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r3 | |
| Net Assets | $ 428,880,651 | |
| Holdings Count | Holding | 100 | |
| Advisory Fees Paid, Amount | $ 2,111,409 | [7] |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 428,880,651 Total Management Fee ($)#: 2,111,409 Total Number of Holdings: 100 Portfolio Turnover Rate (%): 25 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.8 % Money Market Funds 0.2 % Equity sectors Information Technology 23.3 % Health Care 17.1 % Financials 14.3 % Industrials 12.3 % Consumer Staples 9.7 % Utilities 6.5 % Consumer Discretionary 6.5 % Communication Services 4.5 % Real Estate 3.5 % Materials 1.7 % Energy 0.4 % Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % | |
| C000132020 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Equity Fund | |
| Class Name | Class R4 | |
| Trading Symbol | MLVRX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R4 $ 0.65 % | |
| Expenses Paid, Amount | $ 73 | |
| Expense Ratio, Percent | 0.65% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R4 shares of the MFS Low Volatility Equity Fund (fund) provided a total return of 23.41%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s 500 Stock Index: A combination of the fund's security selection and an underweight position in the consumer discretionary sector contributed to relative performance. An underweight position in the energy sector also helped relative results. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Weak stock selection and an underweight position in the information technology sector held back relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R4 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R4 without sales charge 23.41 % 11.46 % 11.37 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r4 | |
| Net Assets | $ 428,880,651 | |
| Holdings Count | Holding | 100 | |
| Advisory Fees Paid, Amount | $ 2,111,409 | [8] |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 428,880,651 Total Management Fee ($)#: 2,111,409 Total Number of Holdings: 100 Portfolio Turnover Rate (%): 25 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.8 % Money Market Funds 0.2 % Equity sectors Information Technology 23.3 % Health Care 17.1 % Financials 14.3 % Industrials 12.3 % Consumer Staples 9.7 % Utilities 6.5 % Consumer Discretionary 6.5 % Communication Services 4.5 % Real Estate 3.5 % Materials 1.7 % Energy 0.4 % Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % | |
| C000132021 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Equity Fund | |
| Class Name | Class R6 | |
| Trading Symbol | MLVTX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 $ 0.56 % | |
| Expenses Paid, Amount | $ 63 | |
| Expense Ratio, Percent | 0.56% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R6 shares of the MFS Low Volatility Equity Fund (fund) provided a total return of 23.55%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s 500 Stock Index: A combination of the fund's security selection and an underweight position in the consumer discretionary sector contributed to relative performance. An underweight position in the energy sector also helped relative results. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Weak stock selection and an underweight position in the information technology sector held back relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R6 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R6 without sales charge 23.55 % 11.56 % 11.47 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r6 | |
| Net Assets | $ 428,880,651 | |
| Holdings Count | Holding | 100 | |
| Advisory Fees Paid, Amount | $ 2,111,409 | [9] |
| Investment Company Portfolio Turnover | 25% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 428,880,651 Total Management Fee ($)#: 2,111,409 Total Number of Holdings: 100 Portfolio Turnover Rate (%): 25 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.8 % Money Market Funds 0.2 % Equity sectors Information Technology 23.3 % Health Care 17.1 % Financials 14.3 % Industrials 12.3 % Consumer Staples 9.7 % Utilities 6.5 % Consumer Discretionary 6.5 % Communication Services 4.5 % Real Estate 3.5 % Materials 1.7 % Energy 0.4 % Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Eli Lilly & Co. 3.3 % Motorola Solutions, Inc. 3.1 % McKesson Corp. 2.7 % Amphenol Corp., "A" 2.6 % TE Connectivity Ltd. 2.5 % Johnson & Johnson 2.5 % Accenture PLC, "A" 2.3 % Merck & Co., Inc. 2.3 % Cognizant Technology Solutions Corp., "A" 2.3 % Microsoft Corp. 2.2 % | |
| C000002210 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® New Discovery Fund | |
| Class Name | Class A | |
| Trading Symbol | MNDAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS New Discovery Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A $ 1.28 % | |
| Expenses Paid, Amount | $ 135 | |
| Expense Ratio, Percent | 1.28% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class A shares of the MFS New Discovery Fund (fund) provided a total return of 10.67%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 2000 ® Security selection within both the industrials and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 2000 ® Security selection within both the information technology and health care sectors detracted from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class A over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr A without sales charge 10.67 % 6.52 % 8.54 % A with initial sales charge (5.75%) 4.31 % 5.26 % 7.90 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 2000 ® 17.67 % 8.35 % 8.21 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/a | |
| Net Assets | $ 2,343,568,777 | |
| Holdings Count | Holding | 109 | |
| Advisory Fees Paid, Amount | $ 19,255,393 | [10] |
| Investment Company Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 2,343,568,777 Total Management Fee ($)#: 19,255,393 Total Number of Holdings: 109 Portfolio Turnover Rate (%): 56 # | |
| Holdings [Text Block] | Where the fund holds derivatives, they are not included in the total number of portfolio holdings. PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 96.6 % Money Market Funds 3.4 % Equity sectors Health Care 22.6 % Industrials 22.6 % Information Technology 19.2 % Consumer Discretionary 10.9 % Energy 5.7 % Financials 4.5 % Materials 3.8 % Real Estate 3.7 % Consumer Staples 3.2 % Communication Services 0.4 % Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % | |
| C000002215 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® New Discovery Fund | |
| Class Name | Class B | |
| Trading Symbol | MNDBX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS New Discovery Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment B $ 2.03 % | |
| Expenses Paid, Amount | $ 213 | |
| Expense Ratio, Percent | 2.03% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class B shares of the MFS New Discovery Fund (fund) provided a total return of 9.82%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 2000 ® Security selection within both the industrials and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 2000 ® Security selection within both the information technology and health care sectors detracted from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class B over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr B without sales charge 9.82 % 5.71 % 7.72 % B with CDSC (declining over six years from 4% to 0%) × 5.82 % 5.48 % 7.72 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 2000 ® 17.67 % 8.35 % 8.21 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/b | |
| Net Assets | $ 2,343,568,777 | |
| Holdings Count | Holding | 109 | |
| Advisory Fees Paid, Amount | $ 19,255,393 | [11] |
| Investment Company Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 2,343,568,777 Total Management Fee ($)#: 19,255,393 Total Number of Holdings: 109 Portfolio Turnover Rate (%): 56 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 96.6 % Money Market Funds 3.4 % Equity sectors Health Care 22.6 % Industrials 22.6 % Information Technology 19.2 % Consumer Discretionary 10.9 % Energy 5.7 % Financials 4.5 % Materials 3.8 % Real Estate 3.7 % Consumer Staples 3.2 % Communication Services 0.4 % Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % | |
| C000002216 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® New Discovery Fund | |
| Class Name | Class C | |
| Trading Symbol | MNDCX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS New Discovery Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C $ 2.03 % | |
| Expenses Paid, Amount | $ 213 | |
| Expense Ratio, Percent | 2.03% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class C shares of the MFS New Discovery Fund (fund) provided a total return of 9.84%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 2000 ® Security selection within both the industrials and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 2000 ® Security selection within both the information technology and health care sectors detracted from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class C over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr C without sales charge 9.84 % 5.72 % 7.72 % C with CDSC (1% for 12 months) × 8.84 % 5.72 % 7.72 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 2000 ® 17.67 % 8.35 % 8.21 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/c | |
| Net Assets | $ 2,343,568,777 | |
| Holdings Count | Holding | 109 | |
| Advisory Fees Paid, Amount | $ 19,255,393 | [12] |
| Investment Company Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 2,343,568,777 Total Management Fee ($)#: 19,255,393 Total Number of Holdings: 109 Portfolio Turnover Rate (%): 56 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 96.6 % Money Market Funds 3.4 % Equity sectors Health Care 22.6 % Industrials 22.6 % Information Technology 19.2 % Consumer Discretionary 10.9 % Energy 5.7 % Financials 4.5 % Materials 3.8 % Real Estate 3.7 % Consumer Staples 3.2 % Communication Services 0.4 % Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % | |
| C000002217 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® New Discovery Fund | |
| Class Name | Class I | |
| Trading Symbol | MNDIX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS New Discovery Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I $ 1.03 % | |
| Expenses Paid, Amount | $ 109 | |
| Expense Ratio, Percent | 1.03% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class I shares of the MFS New Discovery Fund (fund) provided a total return of 10.94%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 2000 ® Security selection within both the industrials and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 2000 ® Security selection within both the information technology and health care sectors detracted from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class I over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr I without sales charge 10.94 % 6.78 % 8.81 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 2000 ® 17.67 % 8.35 % 8.21 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/i | |
| Net Assets | $ 2,343,568,777 | |
| Holdings Count | Holding | 109 | |
| Advisory Fees Paid, Amount | $ 19,255,393 | [13] |
| Investment Company Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 2,343,568,777 Total Management Fee ($)#: 19,255,393 Total Number of Holdings: 109 Portfolio Turnover Rate (%): 56 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 96.6 % Money Market Funds 3.4 % Equity sectors Health Care 22.6 % Industrials 22.6 % Information Technology 19.2 % Consumer Discretionary 10.9 % Energy 5.7 % Financials 4.5 % Materials 3.8 % Real Estate 3.7 % Consumer Staples 3.2 % Communication Services 0.4 % Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % | |
| C000002219 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® New Discovery Fund | |
| Class Name | Class R1 | |
| Trading Symbol | MNDGX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS New Discovery Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R1 $ 2.03 % | |
| Expenses Paid, Amount | $ 213 | |
| Expense Ratio, Percent | 2.03% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R1 shares of the MFS New Discovery Fund (fund) provided a total return of 9.85%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 2000 ® Security selection within both the industrials and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 2000 ® Security selection within both the information technology and health care sectors detracted from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R1 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R1 without sales charge 9.85 % 5.73 % 7.73 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 2000 ® 17.67 % 8.35 % 8.21 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r1 | |
| Net Assets | $ 2,343,568,777 | |
| Holdings Count | Holding | 109 | |
| Advisory Fees Paid, Amount | $ 19,255,393 | [14] |
| Investment Company Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 2,343,568,777 Total Management Fee ($)#: 19,255,393 Total Number of Holdings: 109 Portfolio Turnover Rate (%): 56 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 96.6 % Money Market Funds 3.4 % Equity sectors Health Care 22.6 % Industrials 22.6 % Information Technology 19.2 % Consumer Discretionary 10.9 % Energy 5.7 % Financials 4.5 % Materials 3.8 % Real Estate 3.7 % Consumer Staples 3.2 % Communication Services 0.4 % Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % | |
| C000002221 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® New Discovery Fund | |
| Class Name | Class R2 | |
| Trading Symbol | MNDRX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS New Discovery Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R2 $ 1.53 % | |
| Expenses Paid, Amount | $ 161 | |
| Expense Ratio, Percent | 1.53% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R2 shares of the MFS New Discovery Fund (fund) provided a total return of 10.36%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 2000 ® Security selection within both the industrials and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 2000 ® Security selection within both the information technology and health care sectors detracted from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R2 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R2 without sales charge 10.36 % 6.25 % 8.27 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 2000 ® 17.67 % 8.35 % 8.21 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r2 | |
| Net Assets | $ 2,343,568,777 | |
| Holdings Count | Holding | 109 | |
| Advisory Fees Paid, Amount | $ 19,255,393 | [15] |
| Investment Company Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 2,343,568,777 Total Management Fee ($)#: 19,255,393 Total Number of Holdings: 109 Portfolio Turnover Rate (%): 56 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 96.6 % Money Market Funds 3.4 % Equity sectors Health Care 22.6 % Industrials 22.6 % Information Technology 19.2 % Consumer Discretionary 10.9 % Energy 5.7 % Financials 4.5 % Materials 3.8 % Real Estate 3.7 % Consumer Staples 3.2 % Communication Services 0.4 % Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % | |
| C000002222 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® New Discovery Fund | |
| Class Name | Class R3 | |
| Trading Symbol | MNDHX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS New Discovery Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R3 $ 1.28 % | |
| Expenses Paid, Amount | $ 135 | |
| Expense Ratio, Percent | 1.28% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R3 shares of the MFS New Discovery Fund (fund) provided a total return of 10.70%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 2000 ® Security selection within both the industrials and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 2000 ® Security selection within both the information technology and health care sectors detracted from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R3 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R3 without sales charge 10.70 % 6.52 % 8.53 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 2000 ® 17.67 % 8.35 % 8.21 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r3 | |
| Net Assets | $ 2,343,568,777 | |
| Holdings Count | Holding | 109 | |
| Advisory Fees Paid, Amount | $ 19,255,393 | [16] |
| Investment Company Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 2,343,568,777 Total Management Fee ($)#: 19,255,393 Total Number of Holdings: 109 Portfolio Turnover Rate (%): 56 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 96.6 % Money Market Funds 3.4 % Equity sectors Health Care 22.6 % Industrials 22.6 % Information Technology 19.2 % Consumer Discretionary 10.9 % Energy 5.7 % Financials 4.5 % Materials 3.8 % Real Estate 3.7 % Consumer Staples 3.2 % Communication Services 0.4 % Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % | |
| C000002211 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® New Discovery Fund | |
| Class Name | Class R4 | |
| Trading Symbol | MNDJX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS New Discovery Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R4 $ 1.03 % | |
| Expenses Paid, Amount | $ 109 | |
| Expense Ratio, Percent | 1.03% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R4 shares of the MFS New Discovery Fund (fund) provided a total return of 10.95%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 2000 ® Security selection within both the industrials and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 2000 ® Security selection within both the information technology and health care sectors detracted from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R4 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R4 without sales charge 10.95 % 6.79 % 8.81 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 2000 ® 17.67 % 8.35 % 8.21 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r4 | |
| Net Assets | $ 2,343,568,777 | |
| Holdings Count | Holding | 109 | |
| Advisory Fees Paid, Amount | $ 19,255,393 | [17] |
| Investment Company Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 2,343,568,777 Total Management Fee ($)#: 19,255,393 Total Number of Holdings: 109 Portfolio Turnover Rate (%): 56 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 96.6 % Money Market Funds 3.4 % Equity sectors Health Care 22.6 % Industrials 22.6 % Information Technology 19.2 % Consumer Discretionary 10.9 % Energy 5.7 % Financials 4.5 % Materials 3.8 % Real Estate 3.7 % Consumer Staples 3.2 % Communication Services 0.4 % Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % | |
| C000075013 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® New Discovery Fund | |
| Class Name | Class R6 | |
| Trading Symbol | MNDKX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS New Discovery Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 $ 0.90 % | |
| Expenses Paid, Amount | $ 95 | |
| Expense Ratio, Percent | 0.90% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R6 shares of the MFS New Discovery Fund (fund) provided a total return of 11.10%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 2000 ® Security selection within both the industrials and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 2000 ® Security selection within both the information technology and health care sectors detracted from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R6 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R6 without sales charge 11.10 % 6.91 % 8.93 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 2000 ® 17.67 % 8.35 % 8.21 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r6 | |
| Net Assets | $ 2,343,568,777 | |
| Holdings Count | Holding | 109 | |
| Advisory Fees Paid, Amount | $ 19,255,393 | [18] |
| Investment Company Portfolio Turnover | 56% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 2,343,568,777 Total Management Fee ($)#: 19,255,393 Total Number of Holdings: 109 Portfolio Turnover Rate (%): 56 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 96.6 % Money Market Funds 3.4 % Equity sectors Health Care 22.6 % Industrials 22.6 % Information Technology 19.2 % Consumer Discretionary 10.9 % Energy 5.7 % Financials 4.5 % Materials 3.8 % Real Estate 3.7 % Consumer Staples 3.2 % Communication Services 0.4 % Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Summit Materials, Inc., "A" 2.3 % Crane Co. 2.1 % CACI International, Inc., "A" 2.1 % U.S. Foods Holding Corp. 2.1 % RB Global, Inc. 1.9 % GFL Environmental, Inc. 1.9 % TopBuild Corp. 1.8 % TechnipFMC PLC 1.8 % nVent Electric PLC 1.7 % Jacobs Solutions, Inc. 1.6 % | |
| C000002179 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® U.S. Government Cash Reserve Fund | |
| Class Name | Class A | |
| Trading Symbol | MSRXX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS U.S. Government Cash Reserve Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A $ 0.42 % | |
| Expenses Paid, Amount | $ 43 | |
| Expense Ratio, Percent | 0.42% | |
| Net Assets | $ 476,191,183 | |
| Holdings Count | Holding | 21 | |
| Advisory Fees Paid, Amount | $ 1,834,299 | [19] |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 476,191,183 Total Management Fee ($)#: $ Total Number of Holdings: 21 # | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure U.S. Treasury and U.S. Government Agency Securities and Equivalents 73.7 % Repurchase Agreements, collateralized by U.S. Treasury and/or U.S. Government Agency Securities 26.3 % Composition including fixed income credit quality A-1+ 62.4 % A-1 37.6 % Maturity breakdown 0 - 7 days 31.8 % 8 - 29 days 28.1 % 30 - 59 days 24.8 % 60 - 89 days 12.2 % 90 - 365 days 3.1 % Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| Credit Ratings Selection [Text Block] | Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| C000002182 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® U.S. Government Cash Reserve Fund | |
| Class Name | Class B | |
| Trading Symbol | MCRXX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS U.S. Government Cash Reserve Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment B $ 0.42 % | |
| Expenses Paid, Amount | $ 43 | |
| Expense Ratio, Percent | 0.42% | |
| Net Assets | $ 476,191,183 | |
| Holdings Count | Holding | 21 | |
| Advisory Fees Paid, Amount | $ 1,834,299 | [20] |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 476,191,183 Total Management Fee ($)#: $ Total Number of Holdings: 21 # | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure U.S. Treasury and U.S. Government Agency Securities and Equivalents 73.7 % Repurchase Agreements, collateralized by U.S. Treasury and/or U.S. Government Agency Securities 26.3 % Composition including fixed income credit quality A-1+ 62.4 % A-1 37.6 % Maturity breakdown 0 - 7 days 31.8 % 8 - 29 days 28.1 % 30 - 59 days 24.8 % 60 - 89 days 12.2 % 90 - 365 days 3.1 % Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| Credit Ratings Selection [Text Block] | Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| C000002183 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® U.S. Government Cash Reserve Fund | |
| Class Name | Class C | |
| Trading Symbol | MCCXX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS U.S. Government Cash Reserve Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C $ 0.42 % | |
| Expenses Paid, Amount | $ 43 | |
| Expense Ratio, Percent | 0.42% | |
| Net Assets | $ 476,191,183 | |
| Holdings Count | Holding | 21 | |
| Advisory Fees Paid, Amount | $ 1,834,299 | [21] |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 476,191,183 Total Management Fee ($)#: $ Total Number of Holdings: 21 # | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure U.S. Treasury and U.S. Government Agency Securities and Equivalents 73.7 % Repurchase Agreements, collateralized by U.S. Treasury and/or U.S. Government Agency Securities 26.3 % Composition including fixed income credit quality A-1+ 62.4 % A-1 37.6 % Maturity breakdown 0 - 7 days 31.8 % 8 - 29 days 28.1 % 30 - 59 days 24.8 % 60 - 89 days 12.2 % 90 - 365 days 3.1 % Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| Credit Ratings Selection [Text Block] | Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| C000206005 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® U.S. Government Cash Reserve Fund | |
| Class Name | Class I | |
| Trading Symbol | CRHXX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS U.S. Government Cash Reserve Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I $ 0.42 % | |
| Expenses Paid, Amount | $ 43 | |
| Expense Ratio, Percent | 0.42% | |
| Net Assets | $ 476,191,183 | |
| Holdings Count | Holding | 21 | |
| Advisory Fees Paid, Amount | $ 1,834,299 | [22] |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 476,191,183 Total Management Fee ($)#: $ Total Number of Holdings: 21 # | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure U.S. Treasury and U.S. Government Agency Securities and Equivalents 73.7 % Repurchase Agreements, collateralized by U.S. Treasury and/or U.S. Government Agency Securities 26.3 % Composition including fixed income credit quality A-1+ 62.4 % A-1 37.6 % Maturity breakdown 0 - 7 days 31.8 % 8 - 29 days 28.1 % 30 - 59 days 24.8 % 60 - 89 days 12.2 % 90 - 365 days 3.1 % Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| Credit Ratings Selection [Text Block] | Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| C000002184 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® U.S. Government Cash Reserve Fund | |
| Class Name | Class R1 | |
| Trading Symbol | CRVXX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS U.S. Government Cash Reserve Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R1 $ 0.42 % | |
| Expenses Paid, Amount | $ 43 | |
| Expense Ratio, Percent | 0.42% | |
| Net Assets | $ 476,191,183 | |
| Holdings Count | Holding | 21 | |
| Advisory Fees Paid, Amount | $ 1,834,299 | [23] |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 476,191,183 Total Management Fee ($)#: $ Total Number of Holdings: 21 # | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure U.S. Treasury and U.S. Government Agency Securities and Equivalents 73.7 % Repurchase Agreements, collateralized by U.S. Treasury and/or U.S. Government Agency Securities 26.3 % Composition including fixed income credit quality A-1+ 62.4 % A-1 37.6 % Maturity breakdown 0 - 7 days 31.8 % 8 - 29 days 28.1 % 30 - 59 days 24.8 % 60 - 89 days 12.2 % 90 - 365 days 3.1 % Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| Credit Ratings Selection [Text Block] | Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| C000002186 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® U.S. Government Cash Reserve Fund | |
| Class Name | Class R2 | |
| Trading Symbol | CRMXX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS U.S. Government Cash Reserve Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R2 $ 0.42 % | |
| Expenses Paid, Amount | $ 43 | |
| Expense Ratio, Percent | 0.42% | |
| Net Assets | $ 476,191,183 | |
| Holdings Count | Holding | 21 | |
| Advisory Fees Paid, Amount | $ 1,834,299 | [24] |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 476,191,183 Total Management Fee ($)#: $ Total Number of Holdings: 21 # | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure U.S. Treasury and U.S. Government Agency Securities and Equivalents 73.7 % Repurchase Agreements, collateralized by U.S. Treasury and/or U.S. Government Agency Securities 26.3 % Composition including fixed income credit quality A-1+ 62.4 % A-1 37.6 % Maturity breakdown 0 - 7 days 31.8 % 8 - 29 days 28.1 % 30 - 59 days 24.8 % 60 - 89 days 12.2 % 90 - 365 days 3.1 % Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| Credit Ratings Selection [Text Block] | Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| C000002187 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® U.S. Government Cash Reserve Fund | |
| Class Name | Class R3 | |
| Trading Symbol | CRJXX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS U.S. Government Cash Reserve Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R3 $ 0.42 % | |
| Expenses Paid, Amount | $ 43 | |
| Expense Ratio, Percent | 0.42% | |
| Net Assets | $ 476,191,183 | |
| Holdings Count | Holding | 21 | |
| Advisory Fees Paid, Amount | $ 1,834,299 | [25] |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 476,191,183 Total Management Fee ($)#: $ Total Number of Holdings: 21 # | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure U.S. Treasury and U.S. Government Agency Securities and Equivalents 73.7 % Repurchase Agreements, collateralized by U.S. Treasury and/or U.S. Government Agency Securities 26.3 % Composition including fixed income credit quality A-1+ 62.4 % A-1 37.6 % Maturity breakdown 0 - 7 days 31.8 % 8 - 29 days 28.1 % 30 - 59 days 24.8 % 60 - 89 days 12.2 % 90 - 365 days 3.1 % Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| Credit Ratings Selection [Text Block] | Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| C000002188 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® U.S. Government Cash Reserve Fund | |
| Class Name | Class R4 | |
| Trading Symbol | CRKXX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS U.S. Government Cash Reserve Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R4 $ 0.42 % | |
| Expenses Paid, Amount | $ 43 | |
| Expense Ratio, Percent | 0.42% | |
| Net Assets | $ 476,191,183 | |
| Holdings Count | Holding | 21 | |
| Advisory Fees Paid, Amount | $ 1,834,299 | [26] |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 476,191,183 Total Management Fee ($)#: $ Total Number of Holdings: 21 # | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure U.S. Treasury and U.S. Government Agency Securities and Equivalents 73.7 % Repurchase Agreements, collateralized by U.S. Treasury and/or U.S. Government Agency Securities 26.3 % Composition including fixed income credit quality A-1+ 62.4 % A-1 37.6 % Maturity breakdown 0 - 7 days 31.8 % 8 - 29 days 28.1 % 30 - 59 days 24.8 % 60 - 89 days 12.2 % 90 - 365 days 3.1 % Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| Credit Ratings Selection [Text Block] | Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| C000206004 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® U.S. Government Cash Reserve Fund | |
| Class Name | Class R6 | |
| Trading Symbol | CRRXX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS U.S. Government Cash Reserve Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 $ 0.37 % | |
| Expenses Paid, Amount | $ 38 | |
| Expense Ratio, Percent | 0.37% | |
| Net Assets | $ 476,191,183 | |
| Holdings Count | Holding | 21 | |
| Advisory Fees Paid, Amount | $ 1,834,299 | [27] |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 476,191,183 Total Management Fee ($)#: $ Total Number of Holdings: 21 # | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure U.S. Treasury and U.S. Government Agency Securities and Equivalents 73.7 % Repurchase Agreements, collateralized by U.S. Treasury and/or U.S. Government Agency Securities 26.3 % Composition including fixed income credit quality A-1+ 62.4 % A-1 37.6 % Maturity breakdown 0 - 7 days 31.8 % 8 - 29 days 28.1 % 30 - 59 days 24.8 % 60 - 89 days 12.2 % 90 - 365 days 3.1 % Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| Credit Ratings Selection [Text Block] | Ratings are assigned to portfolio securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. Ratings are shown in the S&P scale. All ratings are subject to change. The fund did not hold unrated securities. The fund is not rated by these agencies. | |
| C000002223 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Research International Fund | |
| Class Name | Class A | |
| Trading Symbol | MRSAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Research International Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A $ 0.98 % | |
| Expenses Paid, Amount | $ 106 | |
| Expense Ratio, Percent | 0.98% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class A shares of the MFS Research International Fund (fund) provided a total return of 16.34%, at net asset value. This compares with a return of 19.40% for the fund’s benchmark, the MSCI EAFE (Europe, Australasia, Far East) Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI EAFE Index: Security selection within both the technology and energy sectors contributed to relative performance. Top detractors from performance relative to the MSCI EAFE Index: Stock selection within both the financial services and consumer cyclicals sectors held back relative results. During the reporting period, the fund's relative currency exposure, resulting primarily from differences between the fund's and the benchmark's exposures to holdings of securities denominated in foreign currencies, was another detractor from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class A over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr A without sales charge 16.34 % 8.11 % 5.11 % A with initial sales charge (5.75%) 9.65 % 6.84 % 4.49 % Comparative Benchmark(s) MSCI EAFE (Europe, Australasia, Far East) Index (net div) ∆ 19.40 % 8.61 % 5.20 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/a | |
| Net Assets | $ 17,004,256,169 | |
| Holdings Count | Holding | 111 | |
| Advisory Fees Paid, Amount | $ 99,431,736 | [28] |
| Investment Company Portfolio Turnover | 17% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 17,004,256,169 Total Management Fee ($)#: 99,431,736 Total Number of Holdings: 111 Portfolio Turnover Rate (%): 17 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.9 % Money Market Funds 1.1 % Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % Issuer country weightings Japan 18.8 % France 14.1 % United Kingdom 11.6 % Switzerland 9.9 % United States 8.7 % Germany 6.6 % Netherlands 5.6 % Denmark 4.3 % Spain 3.6 % Other Countries 16.8 % | |
| Largest Holdings [Text Block] | Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % | |
| C000002228 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Research International Fund | |
| Class Name | Class B | |
| Trading Symbol | MRIBX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Research International Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment B $ 1.73 % | |
| Expenses Paid, Amount | $ 186 | |
| Expense Ratio, Percent | 1.73% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class B shares of the MFS Research International Fund (fund) provided a total return of 15.46%, at net asset value. This compares with a return of 19.40% for the fund’s benchmark, the MSCI EAFE (Europe, Australasia, Far East) Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI EAFE Index: Security selection within both the technology and energy sectors contributed to relative performance. Top detractors from performance relative to the MSCI EAFE Index: Stock selection within both the financial services and consumer cyclicals sectors held back relative results. During the reporting period, the fund's relative currency exposure, resulting primarily from differences between the fund's and the benchmark's exposures to holdings of securities denominated in foreign currencies, was another detractor from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class B over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr B without sales charge 15.46 % 7.30 % 4.32 % B with CDSC (declining over six years from 4% to 0%) × 11.46 % 7.00 % 4.32 % Comparative Benchmark(s) MSCI EAFE (Europe, Australasia, Far East) Index (net div) ∆ 19.40 % 8.61 % 5.20 % ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/b | |
| Net Assets | $ 17,004,256,169 | |
| Holdings Count | Holding | 111 | |
| Advisory Fees Paid, Amount | $ 99,431,736 | [29] |
| Investment Company Portfolio Turnover | 17% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 17,004,256,169 Total Management Fee ($)#: 99,431,736 Total Number of Holdings: 111 Portfolio Turnover Rate (%): 17 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.9 % Money Market Funds 1.1 % Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % Issuer country weightings Japan 18.8 % France 14.1 % United Kingdom 11.6 % Switzerland 9.9 % United States 8.7 % Germany 6.6 % Netherlands 5.6 % Denmark 4.3 % Spain 3.6 % Other Countries 16.8 % | |
| Largest Holdings [Text Block] | Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % | |
| C000002229 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Research International Fund | |
| Class Name | Class C | |
| Trading Symbol | MRICX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Research International Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C $ 1.73 % | |
| Expenses Paid, Amount | $ 186 | |
| Expense Ratio, Percent | 1.73% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class C shares of the MFS Research International Fund (fund) provided a total return of 15.48%, at net asset value. This compares with a return of 19.40% for the fund’s benchmark, the MSCI EAFE (Europe, Australasia, Far East) Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI EAFE Index: Security selection within both the technology and energy sectors contributed to relative performance. Top detractors from performance relative to the MSCI EAFE Index: Stock selection within both the financial services and consumer cyclicals sectors held back relative results. During the reporting period, the fund's relative currency exposure, resulting primarily from differences between the fund's and the benchmark's exposures to holdings of securities denominated in foreign currencies, was another detractor from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class C over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr C without sales charge 15.48 % 7.30 % 4.32 % C with CDSC (1% for 12 months) × 14.48 % 7.30 % 4.32 % Comparative Benchmark(s) MSCI EAFE (Europe, Australasia, Far East) Index (net div) ∆ 19.40 % 8.61 % 5.20 % ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/c | |
| Net Assets | $ 17,004,256,169 | |
| Holdings Count | Holding | 111 | |
| Advisory Fees Paid, Amount | $ 99,431,736 | [30] |
| Investment Company Portfolio Turnover | 17% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 17,004,256,169 Total Management Fee ($)#: 99,431,736 Total Number of Holdings: 111 Portfolio Turnover Rate (%): 17 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.9 % Money Market Funds 1.1 % Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % Issuer country weightings Japan 18.8 % France 14.1 % United Kingdom 11.6 % Switzerland 9.9 % United States 8.7 % Germany 6.6 % Netherlands 5.6 % Denmark 4.3 % Spain 3.6 % Other Countries 16.8 % | |
| Largest Holdings [Text Block] | Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % | |
| C000002230 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Research International Fund | |
| Class Name | Class I | |
| Trading Symbol | MRSIX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Research International Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I $ 0.73 % | |
| Expenses Paid, Amount | $ 79 | |
| Expense Ratio, Percent | 0.73% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class I shares of the MFS Research International Fund (fund) provided a total return of 16.67%, at net asset value. This compares with a return of 19.40% for the fund’s benchmark, the MSCI EAFE (Europe, Australasia, Far East) Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI EAFE Index: Security selection within both the technology and energy sectors contributed to relative performance. Top detractors from performance relative to the MSCI EAFE Index: Stock selection within both the financial services and consumer cyclicals sectors held back relative results. During the reporting period, the fund's relative currency exposure, resulting primarily from differences between the fund's and the benchmark's exposures to holdings of securities denominated in foreign currencies, was another detractor from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class I over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr I without sales charge 16.67 % 8.38 % 5.38 % Comparative Benchmark(s) MSCI EAFE (Europe, Australasia, Far East) Index (net div) ∆ 19.40 % 8.61 % 5.20 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/i | |
| Net Assets | $ 17,004,256,169 | |
| Holdings Count | Holding | 111 | |
| Advisory Fees Paid, Amount | $ 99,431,736 | [31] |
| Investment Company Portfolio Turnover | 17% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 17,004,256,169 Total Management Fee ($)#: 99,431,736 Total Number of Holdings: 111 Portfolio Turnover Rate (%): 17 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.9 % Money Market Funds 1.1 % Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % Issuer country weightings Japan 18.8 % France 14.1 % United Kingdom 11.6 % Switzerland 9.9 % United States 8.7 % Germany 6.6 % Netherlands 5.6 % Denmark 4.3 % Spain 3.6 % Other Countries 16.8 % | |
| Largest Holdings [Text Block] | Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % | |
| C000002232 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Research International Fund | |
| Class Name | Class R1 | |
| Trading Symbol | MRSGX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Research International Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R1 $ 1.74 % | |
| Expenses Paid, Amount | $ 187 | |
| Expense Ratio, Percent | 1.74% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R1 shares of the MFS Research International Fund (fund) provided a total return of 15.43%, at net asset value. This compares with a return of 19.40% for the fund’s benchmark, the MSCI EAFE (Europe, Australasia, Far East) Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI EAFE Index: Security selection within both the technology and energy sectors contributed to relative performance. Top detractors from performance relative to the MSCI EAFE Index: Stock selection within both the financial services and consumer cyclicals sectors held back relative results. During the reporting period, the fund's relative currency exposure, resulting primarily from differences between the fund's and the benchmark's exposures to holdings of securities denominated in foreign currencies, was another detractor from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R1 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R1 without sales charge 15.43 % 7.30 % 4.32 % Comparative Benchmark(s) MSCI EAFE (Europe, Australasia, Far East) Index (net div) ∆ 19.40 % 8.61 % 5.20 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r1 | |
| Net Assets | $ 17,004,256,169 | |
| Holdings Count | Holding | 111 | |
| Advisory Fees Paid, Amount | $ 99,431,736 | [32] |
| Investment Company Portfolio Turnover | 17% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 17,004,256,169 Total Management Fee ($)#: 99,431,736 Total Number of Holdings: 111 Portfolio Turnover Rate (%): 17 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.9 % Money Market Funds 1.1 % Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % Issuer country weightings Japan 18.8 % France 14.1 % United Kingdom 11.6 % Switzerland 9.9 % United States 8.7 % Germany 6.6 % Netherlands 5.6 % Denmark 4.3 % Spain 3.6 % Other Countries 16.8 % | |
| Largest Holdings [Text Block] | Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % | |
| C000002234 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Research International Fund | |
| Class Name | Class R2 | |
| Trading Symbol | MRSRX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Research International Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R2 $ 1.23 % | |
| Expenses Paid, Amount | $ 133 | |
| Expense Ratio, Percent | 1.23% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R2 shares of the MFS Research International Fund (fund) provided a total return of 16.01%, at net asset value. This compares with a return of 19.40% for the fund’s benchmark, the MSCI EAFE (Europe, Australasia, Far East) Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI EAFE Index: Security selection within both the technology and energy sectors contributed to relative performance. Top detractors from performance relative to the MSCI EAFE Index: Stock selection within both the financial services and consumer cyclicals sectors held back relative results. During the reporting period, the fund's relative currency exposure, resulting primarily from differences between the fund's and the benchmark's exposures to holdings of securities denominated in foreign currencies, was another detractor from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R2 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R2 without sales charge 16.01 % 7.84 % 4.85 % Comparative Benchmark(s) MSCI EAFE (Europe, Australasia, Far East) Index (net div) ∆ 19.40 % 8.61 % 5.20 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r2 | |
| Net Assets | $ 17,004,256,169 | |
| Holdings Count | Holding | 111 | |
| Advisory Fees Paid, Amount | $ 99,431,736 | [33] |
| Investment Company Portfolio Turnover | 17% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 17,004,256,169 Total Management Fee ($)#: 99,431,736 Total Number of Holdings: 111 Portfolio Turnover Rate (%): 17 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.9 % Money Market Funds 1.1 % Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % Issuer country weightings Japan 18.8 % France 14.1 % United Kingdom 11.6 % Switzerland 9.9 % United States 8.7 % Germany 6.6 % Netherlands 5.6 % Denmark 4.3 % Spain 3.6 % Other Countries 16.8 % | |
| Largest Holdings [Text Block] | Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % | |
| C000002235 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Research International Fund | |
| Class Name | Class R3 | |
| Trading Symbol | MRSHX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Research International Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R3 $ 0.98 % | |
| Expenses Paid, Amount | $ 106 | |
| Expense Ratio, Percent | 0.98% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R3 shares of the MFS Research International Fund (fund) provided a total return of 16.34%, at net asset value. This compares with a return of 19.40% for the fund’s benchmark, the MSCI EAFE (Europe, Australasia, Far East) Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI EAFE Index: Security selection within both the technology and energy sectors contributed to relative performance. Top detractors from performance relative to the MSCI EAFE Index: Stock selection within both the financial services and consumer cyclicals sectors held back relative results. During the reporting period, the fund's relative currency exposure, resulting primarily from differences between the fund's and the benchmark's exposures to holdings of securities denominated in foreign currencies, was another detractor from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R3 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R3 without sales charge 16.34 % 8.11 % 5.12 % Comparative Benchmark(s) MSCI EAFE (Europe, Australasia, Far East) Index (net div) ∆ 19.40 % 8.61 % 5.20 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r3 | |
| Net Assets | $ 17,004,256,169 | |
| Holdings Count | Holding | 111 | |
| Advisory Fees Paid, Amount | $ 99,431,736 | [34] |
| Investment Company Portfolio Turnover | 17% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 17,004,256,169 Total Management Fee ($)#: 99,431,736 Total Number of Holdings: 111 Portfolio Turnover Rate (%): 17 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.9 % Money Market Funds 1.1 % Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % Issuer country weightings Japan 18.8 % France 14.1 % United Kingdom 11.6 % Switzerland 9.9 % United States 8.7 % Germany 6.6 % Netherlands 5.6 % Denmark 4.3 % Spain 3.6 % Other Countries 16.8 % | |
| Largest Holdings [Text Block] | Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % | |
| C000002190 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Core Equity Fund | |
| Class Name | Class A | |
| Trading Symbol | MRGAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Core Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A $ 0.89 % | |
| Expenses Paid, Amount | $ 100 | |
| Expense Ratio, Percent | 0.89% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class A shares of the MFS Core Equity Fund (fund) provided a total return of 23.92%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 3000 ® Stock selection within both the health care and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 3000 ® Stock selection within the consumer cyclicals and telecommunications & cable TV sectors weighed on relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class A over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr A without sales charge 23.92 % 13.94 % 12.14 % A with initial sales charge (5.75%) 16.80 % 12.60 % 11.48 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/a | |
| Net Assets | $ 6,972,747,254 | |
| Holdings Count | Holding | 186 | |
| Advisory Fees Paid, Amount | $ 32,754,451 | [35] |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 6,972,747,254 Total Management Fee ($)#: 32,754,451 Total Number of Holdings: 186 Portfolio Turnover Rate (%): 30 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % ) Money Market Funds 0.6 % ) Securities Sold Short (0.1 ) % Global equity sectors Technology 36.4 % Financial Services 14.4 % Health Care 13.1 % Capital Goods 11.9 % Consumer Cyclicals 11.7 % Energy 6.3 % Consumer Staples 3.8 % Telecommunications and Cable Television 1.8 % Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| C000002192 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Core Equity Fund | |
| Class Name | Class B | |
| Trading Symbol | MRGBX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Core Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment B $ 1.64 % | |
| Expenses Paid, Amount | $ 183 | |
| Expense Ratio, Percent | 1.64% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class B shares of the MFS Core Equity Fund (fund) provided a total return of 23.00%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 3000 ® Stock selection within both the health care and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 3000 ® Stock selection within the consumer cyclicals and telecommunications & cable TV sectors weighed on relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class B over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr B without sales charge 23.00 % 13.09 % 11.30 % B with CDSC (declining over six years from 4% to 0%) × 19.00 % 12.85 % 11.30 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/b | |
| Net Assets | $ 6,972,747,254 | |
| Holdings Count | Holding | 186 | |
| Advisory Fees Paid, Amount | $ 32,754,451 | [36] |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 6,972,747,254 Total Management Fee ($)#: 32,754,451 Total Number of Holdings: 186 Portfolio Turnover Rate (%): 30 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % ) Money Market Funds 0.6 % ) Securities Sold Short (0.1 ) % Global equity sectors Technology 36.4 % Financial Services 14.4 % Health Care 13.1 % Capital Goods 11.9 % Consumer Cyclicals 11.7 % Energy 6.3 % Consumer Staples 3.8 % Telecommunications and Cable Television 1.8 % Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| C000002193 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Core Equity Fund | |
| Class Name | Class C | |
| Trading Symbol | MRGCX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Core Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C $ 1.64 % | |
| Expenses Paid, Amount | $ 183 | |
| Expense Ratio, Percent | 1.64% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class C shares of the MFS Core Equity Fund (fund) provided a total return of 22.96%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 3000 ® Stock selection within both the health care and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 3000 ® Stock selection within the consumer cyclicals and telecommunications & cable TV sectors weighed on relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class C over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr C without sales charge 22.96 % 13.09 % 11.29 % C with CDSC (1% for 12 months) × 21.96 % 13.09 % 11.29 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/c | |
| Net Assets | $ 6,972,747,254 | |
| Holdings Count | Holding | 186 | |
| Advisory Fees Paid, Amount | $ 32,754,451 | [37] |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 6,972,747,254 Total Management Fee ($)#: 32,754,451 Total Number of Holdings: 186 Portfolio Turnover Rate (%): 30 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % ) Money Market Funds 0.6 % ) Securities Sold Short (0.1 ) % Global equity sectors Technology 36.4 % Financial Services 14.4 % Health Care 13.1 % Capital Goods 11.9 % Consumer Cyclicals 11.7 % Energy 6.3 % Consumer Staples 3.8 % Telecommunications and Cable Television 1.8 % Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| C000002194 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Core Equity Fund | |
| Class Name | Class I | |
| Trading Symbol | MRGRX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Core Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I $ 0.64 % | |
| Expenses Paid, Amount | $ 72 | |
| Expense Ratio, Percent | 0.64% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class I shares of the MFS Core Equity Fund (fund) provided a total return of 24.23%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 3000 ® Stock selection within both the health care and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 3000 ® Stock selection within the consumer cyclicals and telecommunications & cable TV sectors weighed on relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class I over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr I without sales charge 24.23 % 14.23 % 12.41 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/i | |
| Net Assets | $ 6,972,747,254 | |
| Holdings Count | Holding | 186 | |
| Advisory Fees Paid, Amount | $ 32,754,451 | [38] |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 6,972,747,254 Total Management Fee ($)#: 32,754,451 Total Number of Holdings: 186 Portfolio Turnover Rate (%): 30 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % ) Money Market Funds 0.6 % ) Securities Sold Short (0.1 ) % Global equity sectors Technology 36.4 % Financial Services 14.4 % Health Care 13.1 % Capital Goods 11.9 % Consumer Cyclicals 11.7 % Energy 6.3 % Consumer Staples 3.8 % Telecommunications and Cable Television 1.8 % Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| C000002196 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Core Equity Fund | |
| Class Name | Class R1 | |
| Trading Symbol | MRGGX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Core Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R1 $ 1.64 % | |
| Expenses Paid, Amount | $ 183 | |
| Expense Ratio, Percent | 1.64% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R1 shares of the MFS Core Equity Fund (fund) provided a total return of 22.99%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 3000 ® Stock selection within both the health care and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 3000 ® Stock selection within the consumer cyclicals and telecommunications & cable TV sectors weighed on relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R1 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R1 without sales charge 22.99 % 13.10 % 11.30 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r1 | |
| Net Assets | $ 6,972,747,254 | |
| Holdings Count | Holding | 186 | |
| Advisory Fees Paid, Amount | $ 32,754,451 | [39] |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 6,972,747,254 Total Management Fee ($)#: 32,754,451 Total Number of Holdings: 186 Portfolio Turnover Rate (%): 30 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % ) Money Market Funds 0.6 % ) Securities Sold Short (0.1 ) % Global equity sectors Technology 36.4 % Financial Services 14.4 % Health Care 13.1 % Capital Goods 11.9 % Consumer Cyclicals 11.7 % Energy 6.3 % Consumer Staples 3.8 % Telecommunications and Cable Television 1.8 % Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| C000002198 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Core Equity Fund | |
| Class Name | Class R2 | |
| Trading Symbol | MRERX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Core Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R2 $ 1.13 % | |
| Expenses Paid, Amount | $ 126 | |
| Expense Ratio, Percent | 1.13% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R2 shares of the MFS Core Equity Fund (fund) provided a total return of 23.60%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 3000 ® Stock selection within both the health care and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 3000 ® Stock selection within the consumer cyclicals and telecommunications & cable TV sectors weighed on relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R2 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R2 without sales charge 23.60 % 13.67 % 11.86 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r2 | |
| Net Assets | $ 6,972,747,254 | |
| Holdings Count | Holding | 186 | |
| Advisory Fees Paid, Amount | $ 32,754,451 | [40] |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 6,972,747,254 Total Management Fee ($)#: 32,754,451 Total Number of Holdings: 186 Portfolio Turnover Rate (%): 30 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % ) Money Market Funds 0.6 % ) Securities Sold Short (0.1 ) % Global equity sectors Technology 36.4 % Financial Services 14.4 % Health Care 13.1 % Capital Goods 11.9 % Consumer Cyclicals 11.7 % Energy 6.3 % Consumer Staples 3.8 % Telecommunications and Cable Television 1.8 % Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| C000002199 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Core Equity Fund | |
| Class Name | Class R3 | |
| Trading Symbol | MRGHX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Core Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R3 $ 0.89 % | |
| Expenses Paid, Amount | $ 100 | |
| Expense Ratio, Percent | 0.89% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R3 shares of the MFS Core Equity Fund (fund) provided a total return of 23.89%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 3000 ® Stock selection within both the health care and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 3000 ® Stock selection within the consumer cyclicals and telecommunications & cable TV sectors weighed on relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R3 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R3 without sales charge 23.89 % 13.94 % 12.13 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r3 | |
| Net Assets | $ 6,972,747,254 | |
| Holdings Count | Holding | 186 | |
| Advisory Fees Paid, Amount | $ 32,754,451 | [41] |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 6,972,747,254 Total Management Fee ($)#: 32,754,451 Total Number of Holdings: 186 Portfolio Turnover Rate (%): 30 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % ) Money Market Funds 0.6 % ) Securities Sold Short (0.1 ) % Global equity sectors Technology 36.4 % Financial Services 14.4 % Health Care 13.1 % Capital Goods 11.9 % Consumer Cyclicals 11.7 % Energy 6.3 % Consumer Staples 3.8 % Telecommunications and Cable Television 1.8 % Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| C000002191 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Core Equity Fund | |
| Class Name | Class R4 | |
| Trading Symbol | MRGJX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Core Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R4 $ 0.64 % | |
| Expenses Paid, Amount | $ 72 | |
| Expense Ratio, Percent | 0.64% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R4 shares of the MFS Core Equity Fund (fund) provided a total return of 24.22%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 3000 ® Stock selection within both the health care and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 3000 ® Stock selection within the consumer cyclicals and telecommunications & cable TV sectors weighed on relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R4 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R4 without sales charge 24.22 % 14.23 % 12.41 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r4 | |
| Net Assets | $ 6,972,747,254 | |
| Holdings Count | Holding | 186 | |
| Advisory Fees Paid, Amount | $ 32,754,451 | [42] |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 6,972,747,254 Total Management Fee ($)#: 32,754,451 Total Number of Holdings: 186 Portfolio Turnover Rate (%): 30 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % ) Money Market Funds 0.6 % ) Securities Sold Short (0.1 ) % Global equity sectors Technology 36.4 % Financial Services 14.4 % Health Care 13.1 % Capital Goods 11.9 % Consumer Cyclicals 11.7 % Energy 6.3 % Consumer Staples 3.8 % Telecommunications and Cable Television 1.8 % Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| C000124424 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Core Equity Fund | |
| Class Name | Class R6 | |
| Trading Symbol | MRGKX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Core Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 $ 0.56 % | |
| Expenses Paid, Amount | $ 63 | |
| Expense Ratio, Percent | 0.56% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R6 shares of the MFS Core Equity Fund (fund) provided a total return of 24.34%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 3000 ® Stock selection within both the health care and energy sectors contributed to relative performance. Top detractors from performance relative to the Russell 3000 ® Stock selection within the consumer cyclicals and telecommunications & cable TV sectors weighed on relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R6 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R6 without sales charge 24.34 % 14.33 % 12.51 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r6 | |
| Net Assets | $ 6,972,747,254 | |
| Holdings Count | Holding | 186 | |
| Advisory Fees Paid, Amount | $ 32,754,451 | [43] |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 6,972,747,254 Total Management Fee ($)#: 32,754,451 Total Number of Holdings: 186 Portfolio Turnover Rate (%): 30 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % ) Money Market Funds 0.6 % ) Securities Sold Short (0.1 ) % Global equity sectors Technology 36.4 % Financial Services 14.4 % Health Care 13.1 % Capital Goods 11.9 % Consumer Cyclicals 11.7 % Energy 6.3 % Consumer Staples 3.8 % Telecommunications and Cable Television 1.8 % Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 6.9 % Amazon.com, Inc. 4.2 % NVIDIA Corp. 4.2 % Alphabet, Inc., "A" 3.4 % Apple, Inc. 3.2 % Meta Platforms, Inc., "A" 2.3 % JPMorgan Chase & Co. 1.8 % Johnson & Johnson 1.7 % Exxon Mobil Corp. 1.7 % Visa, Inc., "A" 1.6 % | |
| C000002224 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Research International Fund | |
| Class Name | Class R4 | |
| Trading Symbol | MRSJX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Research International Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R4 $ 0.73 % | |
| Expenses Paid, Amount | $ 79 | |
| Expense Ratio, Percent | 0.73% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R4 shares of the MFS Research International Fund (fund) provided a total return of 16.64%, at net asset value. This compares with a return of 19.40% for the fund’s benchmark, the MSCI EAFE (Europe, Australasia, Far East) Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI EAFE Index: Security selection within both the technology and energy sectors contributed to relative performance. Top detractors from performance relative to the MSCI EAFE Index: Stock selection within both the financial services and consumer cyclicals sectors held back relative results. During the reporting period, the fund's relative currency exposure, resulting primarily from differences between the fund's and the benchmark's exposures to holdings of securities denominated in foreign currencies, was another detractor from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R4 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R4 without sales charge 16.64 % 8.38 % 5.37 % Comparative Benchmark(s) MSCI EAFE (Europe, Australasia, Far East) Index (net div) ∆ 19.40 % 8.61 % 5.20 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r4 | |
| Net Assets | $ 17,004,256,169 | |
| Holdings Count | Holding | 111 | |
| Advisory Fees Paid, Amount | $ 99,431,736 | [44] |
| Investment Company Portfolio Turnover | 17% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 17,004,256,169 Total Management Fee ($)#: 99,431,736 Total Number of Holdings: 111 Portfolio Turnover Rate (%): 17 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.9 % Money Market Funds 1.1 % Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % Issuer country weightings Japan 18.8 % France 14.1 % United Kingdom 11.6 % Switzerland 9.9 % United States 8.7 % Germany 6.6 % Netherlands 5.6 % Denmark 4.3 % Spain 3.6 % Other Countries 16.8 % | |
| Largest Holdings [Text Block] | Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % | |
| C000034436 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Research International Fund | |
| Class Name | Class R6 | |
| Trading Symbol | MRSKX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Research International Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 $ 0.63 % | |
| Expenses Paid, Amount | $ 68 | |
| Expense Ratio, Percent | 0.63% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R6 shares of the MFS Research International Fund (fund) provided a total return of 16.74%, at net asset value. This compares with a return of 19.40% for the fund’s benchmark, the MSCI EAFE (Europe, Australasia, Far East) Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI EAFE Index: Security selection within both the technology and energy sectors contributed to relative performance. Top detractors from performance relative to the MSCI EAFE Index: Stock selection within both the financial services and consumer cyclicals sectors held back relative results. During the reporting period, the fund's relative currency exposure, resulting primarily from differences between the fund's and the benchmark's exposures to holdings of securities denominated in foreign currencies, was another detractor from relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R6 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R6 without sales charge 16.74 % 8.50 % 5.48 % Comparative Benchmark(s) MSCI EAFE (Europe, Australasia, Far East) Index (net div) ∆ 19.40 % 8.61 % 5.20 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r6 | |
| Net Assets | $ 17,004,256,169 | |
| Holdings Count | Holding | 111 | |
| Advisory Fees Paid, Amount | $ 99,431,736 | [45] |
| Investment Company Portfolio Turnover | 17% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 17,004,256,169 Total Management Fee ($)#: 99,431,736 Total Number of Holdings: 111 Portfolio Turnover Rate (%): 17 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.9 % Money Market Funds 1.1 % Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % Issuer country weightings Japan 18.8 % France 14.1 % United Kingdom 11.6 % Switzerland 9.9 % United States 8.7 % Germany 6.6 % Netherlands 5.6 % Denmark 4.3 % Spain 3.6 % Other Countries 16.8 % | |
| Largest Holdings [Text Block] | Top ten holdings Novo Nordisk A.S., "B" 3.6 % Schneider Electric SE 3.6 % Linde PLC 3.2 % Roche Holding AG 2.9 % ASML Holding N.V. 2.3 % Hitachi Ltd. 2.3 % Nestle S.A. 2.3 % LVMH Moet Hennessy Louis Vuitton SE 2.1 % TotalEnergies SE 1.7 % NatWest Group PLC 1.5 % | |
| C000002259 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Value Fund | |
| Class Name | Class A | |
| Trading Symbol | MEIAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Value Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A $ 0.79 % | |
| Expenses Paid, Amount | $ 88 | |
| Expense Ratio, Percent | 0.79% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class A shares of the MFS Value Fund (fund) provided a total return of 21.94%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 1000 ® Stock selection and an overweight position in the financials sector contributed to relative performance. The fund's stock selection within the information technology and health care sectors further supported relative returns. Top detractors from performance relative to the Russell 1000 ® Stock selection within the consumer staples and communication services sectors weighed on relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class A over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr A without sales charge 21.94 % 10.74 % 9.38 % A with initial sales charge (5.75%) 14.93 % 9.43 % 8.73 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 1000 ® 21.15 % 11.16 % 8.85 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/a | |
| Net Assets | $ 61,627,987,158 | |
| Holdings Count | Holding | 73 | |
| Advisory Fees Paid, Amount | $ 243,753,125 | [46] |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 61,627,987,158 Total Management Fee ($)#: 243,753,125 Total Number of Holdings: 73 Portfolio Turnover Rate (%): 13 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 27.6 % Industrials 16.6 % Health Care 15.0 % Information Technology 8.7 % Consumer Staples 8.4 % Utilities 8.1 % Energy 6.2 % Consumer Discretionary 3.2 % Materials 2.8 % Real Estate 2.0 % Communication Services 0.9 % Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % | |
| C000002264 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Value Fund | |
| Class Name | Class B | |
| Trading Symbol | MFEBX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Value Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment B $ 1.54 % | |
| Expenses Paid, Amount | $ 170 | |
| Expense Ratio, Percent | 1.54% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class B shares of the MFS Value Fund (fund) provided a total return of 21.04%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 1000 ® Stock selection and an overweight position in the financials sector contributed to relative performance. The fund's stock selection within the information technology and health care sectors further supported relative returns. Top detractors from performance relative to the Russell 1000 ® Stock selection within the consumer staples and communication services sectors weighed on relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class B over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr B without sales charge 21.04 % 9.90 % 8.56 % B with CDSC (declining over six years from 4% to 0%) × 17.04 % 9.63 % 8.56 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 1000 ® 21.15 % 11.16 % 8.85 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/b | |
| Net Assets | $ 61,627,987,158 | |
| Holdings Count | Holding | 73 | |
| Advisory Fees Paid, Amount | $ 243,753,125 | [47] |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 61,627,987,158 Total Management Fee ($)#: 243,753,125 Total Number of Holdings: 73 Portfolio Turnover Rate (%): 13 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 27.6 % Industrials 16.6 % Health Care 15.0 % Information Technology 8.7 % Consumer Staples 8.4 % Utilities 8.1 % Energy 6.2 % Consumer Discretionary 3.2 % Materials 2.8 % Real Estate 2.0 % Communication Services 0.9 % Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % | |
| C000002265 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Value Fund | |
| Class Name | Class C | |
| Trading Symbol | MEICX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Value Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C $ 1.54 % | |
| Expenses Paid, Amount | $ 170 | |
| Expense Ratio, Percent | 1.54% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class C shares of the MFS Value Fund (fund) provided a total return of 21.02%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 1000 ® Stock selection and an overweight position in the financials sector contributed to relative performance. The fund's stock selection within the information technology and health care sectors further supported relative returns. Top detractors from performance relative to the Russell 1000 ® Stock selection within the consumer staples and communication services sectors weighed on relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class C over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr C without sales charge 21.02 % 9.90 % 8.56 % C with CDSC (1% for 12 months) × 20.02 % 9.90 % 8.56 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 1000 ® 21.15 % 11.16 % 8.85 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/c | |
| Net Assets | $ 61,627,987,158 | |
| Holdings Count | Holding | 73 | |
| Advisory Fees Paid, Amount | $ 243,753,125 | [48] |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 61,627,987,158 Total Management Fee ($)#: 243,753,125 Total Number of Holdings: 73 Portfolio Turnover Rate (%): 13 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 27.6 % Industrials 16.6 % Health Care 15.0 % Information Technology 8.7 % Consumer Staples 8.4 % Utilities 8.1 % Energy 6.2 % Consumer Discretionary 3.2 % Materials 2.8 % Real Estate 2.0 % Communication Services 0.9 % Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % | |
| C000002266 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Value Fund | |
| Class Name | Class I | |
| Trading Symbol | MEIIX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Value Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I $ 0.54 % | |
| Expenses Paid, Amount | $ 60 | |
| Expense Ratio, Percent | 0.54% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class I shares of the MFS Value Fund (fund) provided a total return of 22.24%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 1000 ® Stock selection and an overweight position in the financials sector contributed to relative performance. The fund's stock selection within the information technology and health care sectors further supported relative returns. Top detractors from performance relative to the Russell 1000 ® Stock selection within the consumer staples and communication services sectors weighed on relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class I over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr I without sales charge 22.24 % 11.01 % 9.65 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 1000 ® 21.15 % 11.16 % 8.85 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/i | |
| Net Assets | $ 61,627,987,158 | |
| Holdings Count | Holding | 73 | |
| Advisory Fees Paid, Amount | $ 243,753,125 | [49] |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 61,627,987,158 Total Management Fee ($)#: 243,753,125 Total Number of Holdings: 73 Portfolio Turnover Rate (%): 13 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 27.6 % Industrials 16.6 % Health Care 15.0 % Information Technology 8.7 % Consumer Staples 8.4 % Utilities 8.1 % Energy 6.2 % Consumer Discretionary 3.2 % Materials 2.8 % Real Estate 2.0 % Communication Services 0.9 % Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % | |
| C000002268 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Value Fund | |
| Class Name | Class R1 | |
| Trading Symbol | MEIGX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Value Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R1 $ 1.54 % | |
| Expenses Paid, Amount | $ 170 | |
| Expense Ratio, Percent | 1.54% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R1 shares of the MFS Value Fund (fund) provided a total return of 21.04%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 1000 ® Stock selection and an overweight position in the financials sector contributed to relative performance. The fund's stock selection within the information technology and health care sectors further supported relative returns. Top detractors from performance relative to the Russell 1000 ® Stock selection within the consumer staples and communication services sectors weighed on relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R1 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R1 without sales charge 21.04 % 9.91 % 8.56 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 1000 ® 21.15 % 11.16 % 8.85 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r1 | |
| Net Assets | $ 61,627,987,158 | |
| Holdings Count | Holding | 73 | |
| Advisory Fees Paid, Amount | $ 243,753,125 | [50] |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 61,627,987,158 Total Management Fee ($)#: 243,753,125 Total Number of Holdings: 73 Portfolio Turnover Rate (%): 13 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 27.6 % Industrials 16.6 % Health Care 15.0 % Information Technology 8.7 % Consumer Staples 8.4 % Utilities 8.1 % Energy 6.2 % Consumer Discretionary 3.2 % Materials 2.8 % Real Estate 2.0 % Communication Services 0.9 % Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % | |
| C000002270 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Value Fund | |
| Class Name | Class R2 | |
| Trading Symbol | MVRRX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Value Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R2 $ 1.04 % | |
| Expenses Paid, Amount | $ 115 | |
| Expense Ratio, Percent | 1.04% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R2 shares of the MFS Value Fund (fund) provided a total return of 21.65%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 1000 ® Stock selection and an overweight position in the financials sector contributed to relative performance. The fund's stock selection within the information technology and health care sectors further supported relative returns. Top detractors from performance relative to the Russell 1000 ® Stock selection within the consumer staples and communication services sectors weighed on relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R2 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R2 without sales charge 21.65 % 10.46 % 9.11 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 1000 ® 21.15 % 11.16 % 8.85 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r2 | |
| Net Assets | $ 61,627,987,158 | |
| Holdings Count | Holding | 73 | |
| Advisory Fees Paid, Amount | $ 243,753,125 | [51] |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 61,627,987,158 Total Management Fee ($)#: 243,753,125 Total Number of Holdings: 73 Portfolio Turnover Rate (%): 13 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 27.6 % Industrials 16.6 % Health Care 15.0 % Information Technology 8.7 % Consumer Staples 8.4 % Utilities 8.1 % Energy 6.2 % Consumer Discretionary 3.2 % Materials 2.8 % Real Estate 2.0 % Communication Services 0.9 % Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % | |
| C000002271 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Value Fund | |
| Class Name | Class R3 | |
| Trading Symbol | MEIHX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Value Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R3 $ 0.79 % | |
| Expenses Paid, Amount | $ 88 | |
| Expense Ratio, Percent | 0.79% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R3 shares of the MFS Value Fund (fund) provided a total return of 21.95%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 1000 ® Stock selection and an overweight position in the financials sector contributed to relative performance. The fund's stock selection within the information technology and health care sectors further supported relative returns. Top detractors from performance relative to the Russell 1000 ® Stock selection within the consumer staples and communication services sectors weighed on relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R3 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R3 without sales charge 21.95 % 10.73 % 9.38 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 1000 ® 21.15 % 11.16 % 8.85 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r3 | |
| Net Assets | $ 61,627,987,158 | |
| Holdings Count | Holding | 73 | |
| Advisory Fees Paid, Amount | $ 243,753,125 | [52] |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 61,627,987,158 Total Management Fee ($)#: 243,753,125 Total Number of Holdings: 73 Portfolio Turnover Rate (%): 13 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 27.6 % Industrials 16.6 % Health Care 15.0 % Information Technology 8.7 % Consumer Staples 8.4 % Utilities 8.1 % Energy 6.2 % Consumer Discretionary 3.2 % Materials 2.8 % Real Estate 2.0 % Communication Services 0.9 % Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % | |
| C000002260 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Value Fund | |
| Class Name | Class R4 | |
| Trading Symbol | MEIJX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Value Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R4 $ 0.54 % | |
| Expenses Paid, Amount | $ 60 | |
| Expense Ratio, Percent | 0.54% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R4 shares of the MFS Value Fund (fund) provided a total return of 22.23%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 1000 ® Stock selection and an overweight position in the financials sector contributed to relative performance. The fund's stock selection within the information technology and health care sectors further supported relative returns. Top detractors from performance relative to the Russell 1000 ® Stock selection within the consumer staples and communication services sectors weighed on relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R4 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R4 without sales charge 22.23 % 11.01 % 9.65 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 1000 ® 21.15 % 11.16 % 8.85 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r4 | |
| Net Assets | $ 61,627,987,158 | |
| Holdings Count | Holding | 73 | |
| Advisory Fees Paid, Amount | $ 243,753,125 | [53] |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 61,627,987,158 Total Management Fee ($)#: 243,753,125 Total Number of Holdings: 73 Portfolio Turnover Rate (%): 13 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 27.6 % Industrials 16.6 % Health Care 15.0 % Information Technology 8.7 % Consumer Staples 8.4 % Utilities 8.1 % Energy 6.2 % Consumer Discretionary 3.2 % Materials 2.8 % Real Estate 2.0 % Communication Services 0.9 % Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % | |
| C000033014 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Value Fund | |
| Class Name | Class R6 | |
| Trading Symbol | MEIKX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Value Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 $ 0.44 % | |
| Expenses Paid, Amount | $ 49 | |
| Expense Ratio, Percent | 0.44% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R6 shares of the MFS Value Fund (fund) provided a total return of 22.36%, at net asset value. This compares with a return of 26.14% for the fund’s benchmark, the Russell 3000 ® ® As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Russell 1000 ® Stock selection and an overweight position in the financials sector contributed to relative performance. The fund's stock selection within the information technology and health care sectors further supported relative returns. Top detractors from performance relative to the Russell 1000 ® Stock selection within the consumer staples and communication services sectors weighed on relative performance. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R6 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R6 without sales charge 22.36 % 11.13 % 9.77 % Comparative Benchmark(s) Russell 3000 ® 26.14 % 15.19 % 12.36 % Russell 1000 ® 21.15 % 11.16 % 8.85 % + Effective May 1, 2024, the Russell 3000 ® ® ® ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Effective May 1, 2024, the Russell 3000 ® ® ® | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r6 | |
| Net Assets | $ 61,627,987,158 | |
| Holdings Count | Holding | 73 | |
| Advisory Fees Paid, Amount | $ 243,753,125 | [54] |
| Investment Company Portfolio Turnover | 13% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 61,627,987,158 Total Management Fee ($)#: 243,753,125 Total Number of Holdings: 73 Portfolio Turnover Rate (%): 13 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.5 % Money Market Funds 0.5 % Equity sectors Financials 27.6 % Industrials 16.6 % Health Care 15.0 % Information Technology 8.7 % Consumer Staples 8.4 % Utilities 8.1 % Energy 6.2 % Consumer Discretionary 3.2 % Materials 2.8 % Real Estate 2.0 % Communication Services 0.9 % Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings JPMorgan Chase & Co. 4.8 % Progressive Corp. 3.9 % Cigna Group 3.2 % Marsh & McLennan Cos., Inc. 2.4 % McKesson Corp. 2.4 % Aon PLC 2.4 % ConocoPhillips 2.3 % Johnson & Johnson 2.3 % General Dynamics Corp. 2.2 % American Express Co. 2.1 % | |
| C000002249 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Technology Fund | |
| Class Name | Class A | |
| Trading Symbol | MTCAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Technology Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A $ 1.12 % | |
| Expenses Paid, Amount | $ 133 | |
| Expense Ratio, Percent | 1.12% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class A shares of the MFS Technology Fund (fund) provided a total return of 38.29%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. The fund's other benchmark, the Standard & Poor's North American Technology Sector Index, generated a return of 37.48%. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s North American Technology Index: A combination of the fund's underweight position and stock selection in the computer systems industry contributed to relative performance. Stock selection within both the electronics and computer software industries also helped relative results. Top detractors from performance relative to the Standard & Poor’s North American Technology Index: An overweight position and stock selection within the business services industry held back relative performance. Stock selection within the internet industry also weakened relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class A over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr A without sales charge 38.29 % 16.79 % 16.84 % A with initial sales charge (5.75%) 30.34 % 15.41 % 16.15 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % Standard & Poor's North American Technology Sector Index ∆ 37.48 % 21.69 % 20.00 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/a | |
| Net Assets | $ 1,948,596,982 | |
| Holdings Count | Holding | 53 | |
| Advisory Fees Paid, Amount | $ 12,466,295 | [55] |
| Investment Company Portfolio Turnover | 37% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 1,948,596,982 Total Management Fee ($)#: 12,466,295 Total Number of Holdings: 53 Portfolio Turnover Rate (%): 37 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.4 % Money Market Funds 1.6 % Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % Top five industries Computer Software 27.2 % Electronics 24.9 % Internet 21.4 % Computer Software - Systems 14.3 % Business Services 5.2 % For purposes of these classifications, MFS uses its own internal sector/industry classification methodology, which may deviate from classification methodologies used by other industry participants (e.g., the Global Industry Classification Standard). | |
| Largest Holdings [Text Block] | Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % | |
| C000002251 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Technology Fund | |
| Class Name | Class B | |
| Trading Symbol | MTCBX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Technology Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment B $ 1.87 % | |
| Expenses Paid, Amount | $ 222 | |
| Expense Ratio, Percent | 1.87% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class B shares of the MFS Technology Fund (fund) provided a total return of 37.23%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. The fund's other benchmark, the Standard & Poor's North American Technology Sector Index, generated a return of 37.48%. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s North American Technology Index: A combination of the fund's underweight position and stock selection in the computer systems industry contributed to relative performance. Stock selection within both the electronics and computer software industries also helped relative results. Top detractors from performance relative to the Standard & Poor’s North American Technology Index: An overweight position and stock selection within the business services industry held back relative performance. Stock selection within the internet industry also weakened relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class B over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr B without sales charge 37.23 % 15.91 % 15.97 % B with CDSC (declining over six years from 4% to 0%) × 33.23 % 15.69 % 15.97 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % Standard & Poor's North American Technology Sector Index ∆ 37.48 % 21.69 % 20.00 % ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/b | |
| Net Assets | $ 1,948,596,982 | |
| Holdings Count | Holding | 53 | |
| Advisory Fees Paid, Amount | $ 12,466,295 | [56] |
| Investment Company Portfolio Turnover | 37% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 1,948,596,982 Total Management Fee ($)#: 12,466,295 Total Number of Holdings: 53 Portfolio Turnover Rate (%): 37 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.4 % Money Market Funds 1.6 % Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % Top five industries Computer Software 27.2 % Electronics 24.9 % Internet 21.4 % Computer Software - Systems 14.3 % Business Services 5.2 % For purposes of these classifications, MFS uses its own internal sector/industry classification methodology, which may deviate from classification methodologies used by other industry participants (e.g., the Global Industry Classification Standard). | |
| Largest Holdings [Text Block] | Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % | |
| C000002252 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Technology Fund | |
| Class Name | Class C | |
| Trading Symbol | MTCCX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Technology Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C $ 1.87 % | |
| Expenses Paid, Amount | $ 222 | |
| Expense Ratio, Percent | 1.87% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class C shares of the MFS Technology Fund (fund) provided a total return of 37.22%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. The fund's other benchmark, the Standard & Poor's North American Technology Sector Index, generated a return of 37.48%. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s North American Technology Index: A combination of the fund's underweight position and stock selection in the computer systems industry contributed to relative performance. Stock selection within both the electronics and computer software industries also helped relative results. Top detractors from performance relative to the Standard & Poor’s North American Technology Index: An overweight position and stock selection within the business services industry held back relative performance. Stock selection within the internet industry also weakened relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class C over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr C without sales charge 37.22 % 15.91 % 15.97 % C with CDSC (1% for 12 months) × 36.22 % 15.91 % 15.97 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % Standard & Poor's North American Technology Sector Index ∆ 37.48 % 21.69 % 20.00 % ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/c | |
| Net Assets | $ 1,948,596,982 | |
| Holdings Count | Holding | 53 | |
| Advisory Fees Paid, Amount | $ 12,466,295 | [57] |
| Investment Company Portfolio Turnover | 37% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 1,948,596,982 Total Management Fee ($)#: 12,466,295 Total Number of Holdings: 53 Portfolio Turnover Rate (%): 37 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.4 % Money Market Funds 1.6 % Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % Top five industries Computer Software 27.2 % Electronics 24.9 % Internet 21.4 % Computer Software - Systems 14.3 % Business Services 5.2 % For purposes of these classifications, MFS uses its own internal sector/industry classification methodology, which may deviate from classification methodologies used by other industry participants (e.g., the Global Industry Classification Standard). | |
| Largest Holdings [Text Block] | Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % | |
| C000002253 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Technology Fund | |
| Class Name | Class I | |
| Trading Symbol | MTCIX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Technology Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I $ 0.87 % | |
| Expenses Paid, Amount | $ 104 | |
| Expense Ratio, Percent | 0.87% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class I shares of the MFS Technology Fund (fund) provided a total return of 38.63%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. The fund's other benchmark, the Standard & Poor's North American Technology Sector Index, generated a return of 37.48%. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s North American Technology Index: A combination of the fund's underweight position and stock selection in the computer systems industry contributed to relative performance. Stock selection within both the electronics and computer software industries also helped relative results. Top detractors from performance relative to the Standard & Poor’s North American Technology Index: An overweight position and stock selection within the business services industry held back relative performance. Stock selection within the internet industry also weakened relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class I over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr I without sales charge 38.63 % 17.08 % 17.14 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % Standard & Poor's North American Technology Sector Index ∆ 37.48 % 21.69 % 20.00 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/i | |
| Net Assets | $ 1,948,596,982 | |
| Holdings Count | Holding | 53 | |
| Advisory Fees Paid, Amount | $ 12,466,295 | [58] |
| Investment Company Portfolio Turnover | 37% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 1,948,596,982 Total Management Fee ($)#: 12,466,295 Total Number of Holdings: 53 Portfolio Turnover Rate (%): 37 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.4 % Money Market Funds 1.6 % Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % Top five industries Computer Software 27.2 % Electronics 24.9 % Internet 21.4 % Computer Software - Systems 14.3 % Business Services 5.2 % For purposes of these classifications, MFS uses its own internal sector/industry classification methodology, which may deviate from classification methodologies used by other industry participants (e.g., the Global Industry Classification Standard). | |
| Largest Holdings [Text Block] | Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % | |
| C000002255 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Technology Fund | |
| Class Name | Class R1 | |
| Trading Symbol | MTCKX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Technology Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R1 $ 1.87 % | |
| Expenses Paid, Amount | $ 222 | |
| Expense Ratio, Percent | 1.87% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R1 shares of the MFS Technology Fund (fund) provided a total return of 37.27%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. The fund's other benchmark, the Standard & Poor's North American Technology Sector Index, generated a return of 37.48%. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s North American Technology Index: A combination of the fund's underweight position and stock selection in the computer systems industry contributed to relative performance. Stock selection within both the electronics and computer software industries also helped relative results. Top detractors from performance relative to the Standard & Poor’s North American Technology Index: An overweight position and stock selection within the business services industry held back relative performance. Stock selection within the internet industry also weakened relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R1 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R1 without sales charge 37.27 % 15.91 % 15.97 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % Standard & Poor's North American Technology Sector Index ∆ 37.48 % 21.69 % 20.00 % ∆ Source: FactSet Research Systems Inc. If the 1-year without sales charge return included adjustments made for financial reporting purposes in accordance with U.S. generally accepted accounting principles, the return would be 37.24%. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r1 | |
| Net Assets | $ 1,948,596,982 | |
| Holdings Count | Holding | 53 | |
| Advisory Fees Paid, Amount | $ 12,466,295 | [59] |
| Investment Company Portfolio Turnover | 37% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 1,948,596,982 Total Management Fee ($)#: 12,466,295 Total Number of Holdings: 53 Portfolio Turnover Rate (%): 37 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.4 % Money Market Funds 1.6 % Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % Top five industries Computer Software 27.2 % Electronics 24.9 % Internet 21.4 % Computer Software - Systems 14.3 % Business Services 5.2 % For purposes of these classifications, MFS uses its own internal sector/industry classification methodology, which may deviate from classification methodologies used by other industry participants (e.g., the Global Industry Classification Standard). | |
| Largest Holdings [Text Block] | Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % | |
| C000002257 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Technology Fund | |
| Class Name | Class R2 | |
| Trading Symbol | MTERX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Technology Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R2 $ 1.37 % | |
| Expenses Paid, Amount | $ 163 | |
| Expense Ratio, Percent | 1.37% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R2 shares of the MFS Technology Fund (fund) provided a total return of 37.92%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. The fund's other benchmark, the Standard & Poor's North American Technology Sector Index, generated a return of 37.48%. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s North American Technology Index: A combination of the fund's underweight position and stock selection in the computer systems industry contributed to relative performance. Stock selection within both the electronics and computer software industries also helped relative results. Top detractors from performance relative to the Standard & Poor’s North American Technology Index: An overweight position and stock selection within the business services industry held back relative performance. Stock selection within the internet industry also weakened relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R2 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R2 without sales charge 37.92 % 16.49 % 16.55 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % Standard & Poor's North American Technology Sector Index ∆ 37.48 % 21.69 % 20.00 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r2 | |
| Net Assets | $ 1,948,596,982 | |
| Holdings Count | Holding | 53 | |
| Advisory Fees Paid, Amount | $ 12,466,295 | [60] |
| Investment Company Portfolio Turnover | 37% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 1,948,596,982 Total Management Fee ($)#: 12,466,295 Total Number of Holdings: 53 Portfolio Turnover Rate (%): 37 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.4 % Money Market Funds 1.6 % Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % Top five industries Computer Software 27.2 % Electronics 24.9 % Internet 21.4 % Computer Software - Systems 14.3 % Business Services 5.2 % For purposes of these classifications, MFS uses its own internal sector/industry classification methodology, which may deviate from classification methodologies used by other industry participants (e.g., the Global Industry Classification Standard). | |
| Largest Holdings [Text Block] | Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % | |
| C000002258 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Technology Fund | |
| Class Name | Class R3 | |
| Trading Symbol | MTCHX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Technology Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R3 $ 1.12 % | |
| Expenses Paid, Amount | $ 133 | |
| Expense Ratio, Percent | 1.12% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R3 shares of the MFS Technology Fund (fund) provided a total return of 38.26%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. The fund's other benchmark, the Standard & Poor's North American Technology Sector Index, generated a return of 37.48%. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s North American Technology Index: A combination of the fund's underweight position and stock selection in the computer systems industry contributed to relative performance. Stock selection within both the electronics and computer software industries also helped relative results. Top detractors from performance relative to the Standard & Poor’s North American Technology Index: An overweight position and stock selection within the business services industry held back relative performance. Stock selection within the internet industry also weakened relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R3 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R3 without sales charge 38.26 % 16.78 % 16.84 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % Standard & Poor's North American Technology Sector Index ∆ 37.48 % 21.69 % 20.00 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r3 | |
| Net Assets | $ 1,948,596,982 | |
| Holdings Count | Holding | 53 | |
| Advisory Fees Paid, Amount | $ 12,466,295 | [61] |
| Investment Company Portfolio Turnover | 37% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 1,948,596,982 Total Management Fee ($)#: 12,466,295 Total Number of Holdings: 53 Portfolio Turnover Rate (%): 37 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.4 % Money Market Funds 1.6 % Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % Top five industries Computer Software 27.2 % Electronics 24.9 % Internet 21.4 % Computer Software - Systems 14.3 % Business Services 5.2 % For purposes of these classifications, MFS uses its own internal sector/industry classification methodology, which may deviate from classification methodologies used by other industry participants (e.g., the Global Industry Classification Standard). | |
| Largest Holdings [Text Block] | Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % | |
| C000002250 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Technology Fund | |
| Class Name | Class R4 | |
| Trading Symbol | MTCJX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Technology Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R4 $ 0.87 % | |
| Expenses Paid, Amount | $ 104 | |
| Expense Ratio, Percent | 0.87% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R4 shares of the MFS Technology Fund (fund) provided a total return of 38.60%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. The fund's other benchmark, the Standard & Poor's North American Technology Sector Index, generated a return of 37.48%. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s North American Technology Index: A combination of the fund's underweight position and stock selection in the computer systems industry contributed to relative performance. Stock selection within both the electronics and computer software industries also helped relative results. Top detractors from performance relative to the Standard & Poor’s North American Technology Index: An overweight position and stock selection within the business services industry held back relative performance. Stock selection within the internet industry also weakened relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R4 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R4 without sales charge 38.60 % 17.07 % 17.13 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % Standard & Poor's North American Technology Sector Index ∆ 37.48 % 21.69 % 20.00 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r4 | |
| Net Assets | $ 1,948,596,982 | |
| Holdings Count | Holding | 53 | |
| Advisory Fees Paid, Amount | $ 12,466,295 | [62] |
| Investment Company Portfolio Turnover | 37% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 1,948,596,982 Total Management Fee ($)#: 12,466,295 Total Number of Holdings: 53 Portfolio Turnover Rate (%): 37 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.4 % Money Market Funds 1.6 % Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % Top five industries Computer Software 27.2 % Electronics 24.9 % Internet 21.4 % Computer Software - Systems 14.3 % Business Services 5.2 % For purposes of these classifications, MFS uses its own internal sector/industry classification methodology, which may deviate from classification methodologies used by other industry participants (e.g., the Global Industry Classification Standard). | |
| Largest Holdings [Text Block] | Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % | |
| C000124425 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Technology Fund | |
| Class Name | Class R6 | |
| Trading Symbol | MTCLX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Technology Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 $ 0.78 % | |
| Expenses Paid, Amount | $ 93 | |
| Expense Ratio, Percent | 0.78% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R6 shares of the MFS Technology Fund (fund) provided a total return of 38.76%, at net asset value. This compares with a return of 27.14% for the fund’s benchmark, the Standard & Poor's 500 Stock Index. The fund's other benchmark, the Standard & Poor's North American Technology Sector Index, generated a return of 37.48%. As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the Standard & Poor’s North American Technology Index: A combination of the fund's underweight position and stock selection in the computer systems industry contributed to relative performance. Stock selection within both the electronics and computer software industries also helped relative results. Top detractors from performance relative to the Standard & Poor’s North American Technology Index: An overweight position and stock selection within the business services industry held back relative performance. Stock selection within the internet industry also weakened relative returns. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R6 over a ten year period or since inception, if shorter, in comparison to (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of (i) a broad measure of market performance and (ii) an additional index that MFS believes more closely reflects the market segments in which the fund invests, over the same periods. Share Class 1-yr 5-yr 10-yr R6 without sales charge 38.76 % 17.19 % 17.25 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 27.14 % 15.92 % 12.98 % Standard & Poor's North American Technology Sector Index ∆ 37.48 % 21.69 % 20.00 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r6 | |
| Net Assets | $ 1,948,596,982 | |
| Holdings Count | Holding | 53 | |
| Advisory Fees Paid, Amount | $ 12,466,295 | [63] |
| Investment Company Portfolio Turnover | 37% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 1,948,596,982 Total Management Fee ($)#: 12,466,295 Total Number of Holdings: 53 Portfolio Turnover Rate (%): 37 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 98.4 % Money Market Funds 1.6 % Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % Top five industries Computer Software 27.2 % Electronics 24.9 % Internet 21.4 % Computer Software - Systems 14.3 % Business Services 5.2 % For purposes of these classifications, MFS uses its own internal sector/industry classification methodology, which may deviate from classification methodologies used by other industry participants (e.g., the Global Industry Classification Standard). | |
| Largest Holdings [Text Block] | Top ten holdings Meta Platforms, Inc., "A" 10.3 % Microsoft Corp. 9.2 % Alphabet, Inc., "A" 8.1 % Apple, Inc. 6.8 % NVIDIA Corp. 6.0 % Broadcom, Inc. 3.8 % Salesforce, Inc. 3.0 % ServiceNow, Inc. 2.9 % KLA Corp. 2.5 % Accenture PLC, "A" 2.5 % | |
| C000132022 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Global Equity Fund | |
| Class Name | Class A | |
| Trading Symbol | MVGAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Global Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A $ 1.01 % | |
| Expenses Paid, Amount | $ 113 | |
| Expense Ratio, Percent | 1.01% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class A shares of the MFS Low Volatility Global Equity Fund (fund) provided a total return of 23.65%, at net asset value. This compares with a return of 23.44% for the fund’s benchmark, the MSCI All Country World Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI All Country World Index: Security selection and, to a lesser extent, an underweight position in the consumer discretionary sector contributed to relative performance. Security selection within the health care sector also benefited relative results. Additionally, an underweight position in the energy sector further supported relative returns. Top detractors from performance relative to the MSCI All Country World Index: An underweight position and stock selection within the information technology sector detracted from relative performance. Stock selection within the communication services sector also held back relative results. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class A over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr A without sales charge 23.65 % 9.59 % 8.41 % A with initial sales charge (5.75%) 16.54 % 8.30 % 7.77 % Comparative Benchmark(s) MSCI All Country World Index (net div) ∆ 23.44 % 12.14 % 8.78 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/a | |
| Net Assets | $ 278,504,904 | |
| Holdings Count | Holding | 104 | |
| Advisory Fees Paid, Amount | $ 1,369,752 | [64] |
| Investment Company Portfolio Turnover | 32% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 278,504,904 Total Management Fee ($)#: 1,369,752 Total Number of Holdings: 104 Portfolio Turnover Rate (%): 32 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.7 % Money Market Funds 0.3 % Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % Issuer country weightings United States 57.2 % Japan 10.6 % Canada 5.9 % Singapore 5.0 % Switzerland 3.3 % Thailand 3.1 % Philippines 2.8 % United Kingdom 2.7 % South Korea 2.1 % Other Countries 7.3 % | |
| Largest Holdings [Text Block] | Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % | |
| C000132023 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Global Equity Fund | |
| Class Name | Class B | |
| Trading Symbol | MVGBX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Global Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment B $ 1.76 % | |
| Expenses Paid, Amount | $ 196 | |
| Expense Ratio, Percent | 1.76% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class B shares of the MFS Low Volatility Global Equity Fund (fund) provided a total return of 22.73%, at net asset value. This compares with a return of 23.44% for the fund’s benchmark, the MSCI All Country World Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI All Country World Index: Security selection and, to a lesser extent, an underweight position in the consumer discretionary sector contributed to relative performance. Security selection within the health care sector also benefited relative results. Additionally, an underweight position in the energy sector further supported relative returns. Top detractors from performance relative to the MSCI All Country World Index: An underweight position and stock selection within the information technology sector detracted from relative performance. Stock selection within the communication services sector also held back relative results. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class B over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr B without sales charge 22.73 % 8.77 % 7.58 % B with CDSC (declining over six years from 4% to 0%) × 18.73 % 8.49 % 7.58 % Comparative Benchmark(s) MSCI All Country World Index (net div) ∆ 23.44 % 12.14 % 8.78 % ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/b | |
| Net Assets | $ 278,504,904 | |
| Holdings Count | Holding | 104 | |
| Advisory Fees Paid, Amount | $ 1,369,752 | [65] |
| Investment Company Portfolio Turnover | 32% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 278,504,904 Total Management Fee ($)#: 1,369,752 Total Number of Holdings: 104 Portfolio Turnover Rate (%): 32 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.7 % Money Market Funds 0.3 % Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % Issuer country weightings United States 57.2 % Japan 10.6 % Canada 5.9 % Singapore 5.0 % Switzerland 3.3 % Thailand 3.1 % Philippines 2.8 % United Kingdom 2.7 % South Korea 2.1 % Other Countries 7.3 % | |
| Largest Holdings [Text Block] | Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % | |
| C000132024 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Global Equity Fund | |
| Class Name | Class C | |
| Trading Symbol | MVGCX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Global Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment C $ 1.76 % | |
| Expenses Paid, Amount | $ 196 | |
| Expense Ratio, Percent | 1.76% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class C shares of the MFS Low Volatility Global Equity Fund (fund) provided a total return of 22.73%, at net asset value. This compares with a return of 23.44% for the fund’s benchmark, the MSCI All Country World Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI All Country World Index: Security selection and, to a lesser extent, an underweight position in the consumer discretionary sector contributed to relative performance. Security selection within the health care sector also benefited relative results. Additionally, an underweight position in the energy sector further supported relative returns. Top detractors from performance relative to the MSCI All Country World Index: An underweight position and stock selection within the information technology sector detracted from relative performance. Stock selection within the communication services sector also held back relative results. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class C over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr C without sales charge 22.73 % 8.78 % 7.58 % C with CDSC (1% for 12 months) × 21.73 % 8.78 % 7.58 % Comparative Benchmark(s) MSCI All Country World Index (net div) ∆ 23.44 % 12.14 % 8.78 % ∆ Source: FactSet Research Systems Inc. × Assuming redemption at the end of the applicable period. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/c | |
| Net Assets | $ 278,504,904 | |
| Holdings Count | Holding | 104 | |
| Advisory Fees Paid, Amount | $ 1,369,752 | [66] |
| Investment Company Portfolio Turnover | 32% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 278,504,904 Total Management Fee ($)#: 1,369,752 Total Number of Holdings: 104 Portfolio Turnover Rate (%): 32 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.7 % Money Market Funds 0.3 % Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % Issuer country weightings United States 57.2 % Japan 10.6 % Canada 5.9 % Singapore 5.0 % Switzerland 3.3 % Thailand 3.1 % Philippines 2.8 % United Kingdom 2.7 % South Korea 2.1 % Other Countries 7.3 % | |
| Largest Holdings [Text Block] | Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % | |
| C000132025 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Global Equity Fund | |
| Class Name | Class I | |
| Trading Symbol | MVGIX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Global Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I $ 0.76 % | |
| Expenses Paid, Amount | $ 85 | |
| Expense Ratio, Percent | 0.76% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class I shares of the MFS Low Volatility Global Equity Fund (fund) provided a total return of 23.94%, at net asset value. This compares with a return of 23.44% for the fund’s benchmark, the MSCI All Country World Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI All Country World Index: Security selection and, to a lesser extent, an underweight position in the consumer discretionary sector contributed to relative performance. Security selection within the health care sector also benefited relative results. Additionally, an underweight position in the energy sector further supported relative returns. Top detractors from performance relative to the MSCI All Country World Index: An underweight position and stock selection within the information technology sector detracted from relative performance. Stock selection within the communication services sector also held back relative results. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class I over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr I without sales charge 23.94 % 9.87 % 8.67 % Comparative Benchmark(s) MSCI All Country World Index (net div) ∆ 23.44 % 12.14 % 8.78 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/i | |
| Net Assets | $ 278,504,904 | |
| Holdings Count | Holding | 104 | |
| Advisory Fees Paid, Amount | $ 1,369,752 | [67] |
| Investment Company Portfolio Turnover | 32% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 278,504,904 Total Management Fee ($)#: 1,369,752 Total Number of Holdings: 104 Portfolio Turnover Rate (%): 32 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.7 % Money Market Funds 0.3 % Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % Issuer country weightings United States 57.2 % Japan 10.6 % Canada 5.9 % Singapore 5.0 % Switzerland 3.3 % Thailand 3.1 % Philippines 2.8 % United Kingdom 2.7 % South Korea 2.1 % Other Countries 7.3 % | |
| Largest Holdings [Text Block] | Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % | |
| C000132026 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Global Equity Fund | |
| Class Name | Class R1 | |
| Trading Symbol | MVGJX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Global Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R1 $ 1.76 % | |
| Expenses Paid, Amount | $ 196 | |
| Expense Ratio, Percent | 1.76% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R1 shares of the MFS Low Volatility Global Equity Fund (fund) provided a total return of 22.74%, at net asset value. This compares with a return of 23.44% for the fund’s benchmark, the MSCI All Country World Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI All Country World Index: Security selection and, to a lesser extent, an underweight position in the consumer discretionary sector contributed to relative performance. Security selection within the health care sector also benefited relative results. Additionally, an underweight position in the energy sector further supported relative returns. Top detractors from performance relative to the MSCI All Country World Index: An underweight position and stock selection within the information technology sector detracted from relative performance. Stock selection within the communication services sector also held back relative results. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R1 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R1 without sales charge 22.74 % 8.77 % 7.58 % Comparative Benchmark(s) MSCI All Country World Index (net div) ∆ 23.44 % 12.14 % 8.78 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r1 | |
| Net Assets | $ 278,504,904 | |
| Holdings Count | Holding | 104 | |
| Advisory Fees Paid, Amount | $ 1,369,752 | [68] |
| Investment Company Portfolio Turnover | 32% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 278,504,904 Total Management Fee ($)#: 1,369,752 Total Number of Holdings: 104 Portfolio Turnover Rate (%): 32 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.7 % Money Market Funds 0.3 % Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % Issuer country weightings United States 57.2 % Japan 10.6 % Canada 5.9 % Singapore 5.0 % Switzerland 3.3 % Thailand 3.1 % Philippines 2.8 % United Kingdom 2.7 % South Korea 2.1 % Other Countries 7.3 % | |
| Largest Holdings [Text Block] | Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % | |
| C000132027 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Global Equity Fund | |
| Class Name | Class R2 | |
| Trading Symbol | MVGKX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Global Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R2 $ 1.26 % | |
| Expenses Paid, Amount | $ 141 | |
| Expense Ratio, Percent | 1.26% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R2 shares of the MFS Low Volatility Global Equity Fund (fund) provided a total return of 23.33%, at net asset value. This compares with a return of 23.44% for the fund’s benchmark, the MSCI All Country World Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI All Country World Index: Security selection and, to a lesser extent, an underweight position in the consumer discretionary sector contributed to relative performance. Security selection within the health care sector also benefited relative results. Additionally, an underweight position in the energy sector further supported relative returns. Top detractors from performance relative to the MSCI All Country World Index: An underweight position and stock selection within the information technology sector detracted from relative performance. Stock selection within the communication services sector also held back relative results. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R2 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R2 without sales charge 23.33 % 9.32 % 8.12 % Comparative Benchmark(s) MSCI All Country World Index (net div) ∆ 23.44 % 12.14 % 8.78 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r2 | |
| Net Assets | $ 278,504,904 | |
| Holdings Count | Holding | 104 | |
| Advisory Fees Paid, Amount | $ 1,369,752 | [69] |
| Investment Company Portfolio Turnover | 32% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 278,504,904 Total Management Fee ($)#: 1,369,752 Total Number of Holdings: 104 Portfolio Turnover Rate (%): 32 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.7 % Money Market Funds 0.3 % Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % Issuer country weightings United States 57.2 % Japan 10.6 % Canada 5.9 % Singapore 5.0 % Switzerland 3.3 % Thailand 3.1 % Philippines 2.8 % United Kingdom 2.7 % South Korea 2.1 % Other Countries 7.3 % | |
| Largest Holdings [Text Block] | Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % | |
| C000132028 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Global Equity Fund | |
| Class Name | Class R3 | |
| Trading Symbol | MVGLX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Global Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R3 $ 1.01 % | |
| Expenses Paid, Amount | $ 113 | |
| Expense Ratio, Percent | 1.01% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R3 shares of the MFS Low Volatility Global Equity Fund (fund) provided a total return of 23.67%, at net asset value. This compares with a return of 23.44% for the fund’s benchmark, the MSCI All Country World Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI All Country World Index: Security selection and, to a lesser extent, an underweight position in the consumer discretionary sector contributed to relative performance. Security selection within the health care sector also benefited relative results. Additionally, an underweight position in the energy sector further supported relative returns. Top detractors from performance relative to the MSCI All Country World Index: An underweight position and stock selection within the information technology sector detracted from relative performance. Stock selection within the communication services sector also held back relative results. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R3 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R3 without sales charge 23.67 % 9.60 % 8.40 % Comparative Benchmark(s) MSCI All Country World Index (net div) ∆ 23.44 % 12.14 % 8.78 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r3 | |
| Net Assets | $ 278,504,904 | |
| Holdings Count | Holding | 104 | |
| Advisory Fees Paid, Amount | $ 1,369,752 | [70] |
| Investment Company Portfolio Turnover | 32% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 278,504,904 Total Management Fee ($)#: 1,369,752 Total Number of Holdings: 104 Portfolio Turnover Rate (%): 32 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.7 % Money Market Funds 0.3 % Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % Issuer country weightings United States 57.2 % Japan 10.6 % Canada 5.9 % Singapore 5.0 % Switzerland 3.3 % Thailand 3.1 % Philippines 2.8 % United Kingdom 2.7 % South Korea 2.1 % Other Countries 7.3 % | |
| Largest Holdings [Text Block] | Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % | |
| C000132029 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Global Equity Fund | |
| Class Name | Class R4 | |
| Trading Symbol | MVGMX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Global Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R4 $ 0.76 % | |
| Expenses Paid, Amount | $ 85 | |
| Expense Ratio, Percent | 0.76% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R4 shares of the MFS Low Volatility Global Equity Fund (fund) provided a total return of 24.01%, at net asset value. This compares with a return of 23.44% for the fund’s benchmark, the MSCI All Country World Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI All Country World Index: Security selection and, to a lesser extent, an underweight position in the consumer discretionary sector contributed to relative performance. Security selection within the health care sector also benefited relative results. Additionally, an underweight position in the energy sector further supported relative returns. Top detractors from performance relative to the MSCI All Country World Index: An underweight position and stock selection within the information technology sector detracted from relative performance. Stock selection within the communication services sector also held back relative results. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R4 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R4 without sales charge 24.01 % 9.88 % 8.66 % Comparative Benchmark(s) MSCI All Country World Index (net div) ∆ 23.44 % 12.14 % 8.78 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r4 | |
| Net Assets | $ 278,504,904 | |
| Holdings Count | Holding | 104 | |
| Advisory Fees Paid, Amount | $ 1,369,752 | [71] |
| Investment Company Portfolio Turnover | 32% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 278,504,904 Total Management Fee ($)#: 1,369,752 Total Number of Holdings: 104 Portfolio Turnover Rate (%): 32 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.7 % Money Market Funds 0.3 % Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % Issuer country weightings United States 57.2 % Japan 10.6 % Canada 5.9 % Singapore 5.0 % Switzerland 3.3 % Thailand 3.1 % Philippines 2.8 % United Kingdom 2.7 % South Korea 2.1 % Other Countries 7.3 % | |
| Largest Holdings [Text Block] | Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % | |
| C000132030 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Low Volatility Global Equity Fund | |
| Class Name | Class R6 | |
| Trading Symbol | MVGNX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Low Volatility Global Equity Fund for the period of September 1, 2023 to August 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the fund at funds.mfs.com | |
| Additional Information Phone Number | 1‑800‑225‑2606 | |
| Additional Information Email | orderliterature@mfs.com | |
| Additional Information Website | funds.mfs.com | |
| Expenses [Text Block] | FUND EXPENSES What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 $ 0.67 % | |
| Expenses Paid, Amount | $ 75 | |
| Expense Ratio, Percent | 0.67% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended August 31, 2024, Class R6 shares of the MFS Low Volatility Global Equity Fund (fund) provided a total return of 24.08%, at net asset value. This compares with a return of 23.44% for the fund’s benchmark, the MSCI All Country World Index (net div). As inflation moderated around the globe during the reporting period, several major central banks began to ease monetary policy. Geopolitical strains remained high amid ongoing conflicts in Ukraine and in the Middle East, while relations between China and the US remained tense. The US sought to restrict the flow of advanced technologies to China and China looked to use its industrial overcapacity to increase exports to developed markets to bolster its slow-growing domestic economy. Toward the end of the period, labor markets, particularly in the US, loosened modestly, brightening the inflation outlook. Global equity markets reached record levels during the period as they withstood the adversity of the unsettled geopolitical climate and higher interest rate environment amidst optimism over wide-scale adoption of artificial intelligence. Top contributors to performance relative to the MSCI All Country World Index: Security selection and, to a lesser extent, an underweight position in the consumer discretionary sector contributed to relative performance. Security selection within the health care sector also benefited relative results. Additionally, an underweight position in the energy sector further supported relative returns. Top detractors from performance relative to the MSCI All Country World Index: An underweight position and stock selection within the information technology sector detracted from relative performance. Stock selection within the communication services sector also held back relative results. | |
| 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 fund’s past performance is not a good predictor of the fund’s future performance. Growth of a Hypothetical $10,000 Investment This graph shows the performance of a hypothetical $10,000 investment in Class R6 over a ten year period or since inception, if shorter, in comparison to a broad measure of market performance. This graph includes the deduction of the maximum applicable sales charge, if any. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns through 8/31/24 This table shows the average annual total returns of the class of shares noted for the periods shown, both with (if any) and without sales charges. It also shows the average annual total returns of a broad measure of market performance over the same periods. Share Class 1-yr 5-yr 10-yr R6 without sales charge 24.08 % 9.96 % 8.73 % Comparative Benchmark(s) MSCI All Country World Index (net div) ∆ 23.44 % 12.14 % 8.78 % ∆ Source: FactSet Research Systems Inc. | |
| No Deduction of Taxes [Text Block] | The graph and table below do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit mfs.com/perf/r6 | |
| Net Assets | $ 278,504,904 | |
| Holdings Count | Holding | 104 | |
| Advisory Fees Paid, Amount | $ 1,369,752 | [72] |
| Investment Company Portfolio Turnover | 32% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 8/31/24 Net Assets ($): 278,504,904 Total Management Fee ($)#: 1,369,752 Total Number of Holdings: 104 Portfolio Turnover Rate (%): 32 # Where the fund holds derivatives, they are not included in the total number of portfolio holdings. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION (BASED ON TOTAL INVESTMENTS AS OF 8/31/24) Portfolio structure Equities 99.7 % Money Market Funds 0.3 % Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % Issuer country weightings United States 57.2 % Japan 10.6 % Canada 5.9 % Singapore 5.0 % Switzerland 3.3 % Thailand 3.1 % Philippines 2.8 % United Kingdom 2.7 % South Korea 2.1 % Other Countries 7.3 % | |
| Largest Holdings [Text Block] | Top ten holdings Colgate-Palmolive Co. 2.9 % McKesson Corp. 2.9 % DBS Group Holdings Ltd. 2.6 % Microsoft Corp. 2.3 % Constellation Software, Inc. 2.3 % Eli Lilly & Co. 2.3 % Johnson & Johnson 2.2 % Roche Holding AG 2.0 % Jollibee Foods Corp. 2.0 % KDDI Corp. 2.0 % | |
| [1]Includes the effect of any management fee waivers.[2]Includes the effect of any management fee waivers.[3]Includes the effect of any management fee waivers.[4]Includes the effect of any management fee waivers.[5]Includes the effect of any management fee waivers.[6]Includes the effect of any management fee waivers.[7]Includes the effect of any management fee waivers.[8]Includes the effect of any management fee waivers.[9]Includes the effect of any management fee waivers.[10]Includes the effect of any management fee waivers.[11]Includes the effect of any management fee waivers.[12]Includes the effect of any management fee waivers.[13]Includes the effect of any management fee waivers.[14]Includes the effect of any management fee waivers.[15]Includes the effect of any management fee waivers.[16]Includes the effect of any management fee waivers.[17]Includes the effect of any management fee waivers.[18]Includes the effect of any management fee waivers.[19]Includes the effect of any management fee waivers.[20]Includes the effect of any management fee waivers.[21]Includes the effect of any management fee waivers.[22]Includes the effect of any management fee waivers.[23]Includes the effect of any management fee waivers.[24]Includes the effect of any management fee waivers.[25]Includes the effect of any management fee waivers.[26]Includes the effect of any management fee waivers.[27]Includes the effect of any management fee waivers.[28]Includes the effect of any management fee waivers.[29]Includes the effect of any management fee waivers.[30]Includes the effect of any management fee waivers.[31]Includes the effect of any management fee waivers.[32]Includes the effect of any management fee waivers.[33]Includes the effect of any management fee waivers.[34]Includes the effect of any management fee waivers.[35]Includes the effect of any management fee waivers.[36]Includes the effect of any management fee waivers.[37]Includes the effect of any management fee waivers.[38]Includes the effect of any management fee waivers.[39]Includes the effect of any management fee waivers.[40]Includes the effect of any management fee waivers.[41]Includes the effect of any management fee waivers.[42]Includes the effect of any management fee waivers.[43]Includes the effect of any management fee waivers.[44]Includes the effect of any management fee waivers.[45]Includes the effect of any management fee waivers.[46]Includes the effect of any management fee waivers.[47]Includes the effect of any management fee waivers.[48]Includes the effect of any management fee waivers.[49]Includes the effect of any management fee waivers.[50]Includes the effect of any management fee waivers.[51]Includes the effect of any management fee waivers.[52]Includes the effect of any management fee waivers.[53]Includes the effect of any management fee waivers.[54]Includes the effect of any management fee waivers.[55]Includes the effect of any management fee waivers.[56]Includes the effect of any management fee waivers.[57]Includes the effect of any management fee waivers.[58]Includes the effect of any management fee waivers.[59]Includes the effect of any management fee waivers.[60]Includes the effect of any management fee waivers.[61]Includes the effect of any management fee waivers.[62]Includes the effect of any management fee waivers.[63]Includes the effect of any management fee waivers.[64]Includes the effect of any management fee waivers.[65]Includes the effect of any management fee waivers.[66]Includes the effect of any management fee waivers.[67]Includes the effect of any management fee waivers.[68]Includes the effect of any management fee waivers.[69]Includes the effect of any management fee waivers.[70]Includes the effect of any management fee waivers.[71]Includes the effect of any management fee waivers.[72]Includes the effect of any management fee waivers. | ||
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 60 Months Ended | 120 Months Ended | |||||||||||
| Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2023 | Aug. 31, 2022 | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014 | ||
| C000132013 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A with initial sales charge (5.75%) | |||||||||||||
| Average Annual Return, Percent | 16.08% | 9.89% | 10.45% | |||||||||||
| C000132013 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A without sales charge | |||||||||||||
| Account Value | $ 27,029 | $ 27,029 | $ 27,029 | $ 21,947 | $ 20,318 | $ 22,443 | $ 17,112 | $ 15,897 | $ 14,041 | $ 12,520 | $ 11,261 | $ 9,803 | $ 9,425 | |
| Average Annual Return, Percent | 23.16% | 11.20% | 11.11% | |||||||||||
| C000132014 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B with CDSC (declining over six years from 4% to 0%) | |||||||||||||
| Average Annual Return, Percent | [1] | 18.19% | 10.08% | 10.27% | ||||||||||
| C000132014 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B without sales charge | |||||||||||||
| Account Value | $ 26,576 | $ 26,576 | $ 26,576 | 21,750 | 20,284 | 22,575 | 17,340 | 16,241 | 14,448 | 12,979 | 11,761 | 10,320 | 10,000 | |
| Average Annual Return, Percent | 22.19% | 10.35% | 10.27% | |||||||||||
| C000132015 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C with CDSC (1% for 12 months) | |||||||||||||
| Average Annual Return, Percent | [2] | 21.24% | 10.36% | 10.27% | ||||||||||
| C000132015 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C without sales charge | |||||||||||||
| Account Value | $ 26,587 | $ 26,587 | $ 26,587 | 21,751 | 20,285 | 22,575 | 17,339 | 16,243 | 14,452 | 12,977 | 11,759 | 10,323 | 10,000 | |
| Average Annual Return, Percent | 22.24% | 10.36% | 10.27% | |||||||||||
| C000132016 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | I without sales charge | |||||||||||||
| Account Value | $ 29,358 | $ 29,358 | $ 29,358 | 23,789 | 21,957 | 24,205 | 18,400 | 17,065 | 15,028 | 13,359 | 11,988 | 10,420 | 10,000 | |
| Average Annual Return, Percent | 23.41% | 11.46% | 11.37% | |||||||||||
| C000132017 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R1 without sales charge | |||||||||||||
| Account Value | $ 26,574 | $ 26,574 | $ 26,574 | 21,749 | 20,283 | 22,568 | 17,336 | 16,234 | 14,447 | 12,972 | 11,758 | 10,318 | 10,000 | |
| Average Annual Return, Percent | 22.19% | 10.36% | 10.27% | |||||||||||
| C000132018 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R2 without sales charge | |||||||||||||
| Account Value | $ 27,960 | $ 27,960 | $ 27,960 | 22,755 | 21,120 | 23,392 | 17,874 | 16,659 | 14,750 | 13,177 | 11,879 | 10,369 | 10,000 | |
| Average Annual Return, Percent | 22.88% | 10.91% | 10.83% | |||||||||||
| C000132019 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R3 without sales charge | |||||||||||||
| Account Value | $ 28,666 | $ 28,666 | $ 28,666 | 23,285 | 21,551 | 23,809 | 18,152 | 16,862 | 14,891 | 13,275 | 11,936 | 10,404 | 10,000 | |
| Average Annual Return, Percent | 23.11% | 11.20% | 11.11% | |||||||||||
| C000132020 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R4 without sales charge | |||||||||||||
| Account Value | $ 29,349 | $ 29,349 | $ 29,349 | 23,782 | 21,965 | 24,197 | 18,405 | 17,062 | 15,028 | 13,361 | 11,992 | 10,420 | 10,000 | |
| Average Annual Return, Percent | 23.41% | 11.46% | 11.37% | |||||||||||
| C000132021 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R6 without sales charge | |||||||||||||
| Account Value | $ 29,626 | $ 29,626 | $ 29,626 | 23,978 | 22,124 | 24,348 | 18,506 | 17,143 | 15,087 | 13,402 | 12,007 | 10,422 | 10,000 | |
| Average Annual Return, Percent | 23.55% | 11.56% | 11.47% | |||||||||||
| C000002210 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A with initial sales charge (5.75%) | |||||||||||||
| Average Annual Return, Percent | 4.31% | 5.26% | 7.90% | |||||||||||
| C000002210 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A without sales charge | |||||||||||||
| Account Value | $ 21,382 | $ 21,382 | $ 21,382 | 19,319 | 18,217 | 27,685 | 19,884 | 15,594 | 15,068 | 11,163 | 9,637 | 9,469 | 9,425 | |
| Average Annual Return, Percent | 10.67% | 6.52% | 8.54% | |||||||||||
| C000002215 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B with CDSC (declining over six years from 4% to 0%) | |||||||||||||
| Average Annual Return, Percent | [3] | 5.82% | 5.48% | 7.72% | ||||||||||
| C000002215 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B without sales charge | |||||||||||||
| Account Value | $ 21,039 | $ 21,039 | $ 21,039 | 19,158 | 18,199 | 27,874 | 20,170 | 15,935 | 15,517 | 11,579 | 10,072 | 9,973 | 10,000 | |
| Average Annual Return, Percent | 9.82% | 5.71% | 7.72% | |||||||||||
| C000002216 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C with CDSC (1% for 12 months) | |||||||||||||
| Average Annual Return, Percent | [4] | 8.84% | 5.72% | 7.72% | ||||||||||
| C000002216 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C without sales charge | |||||||||||||
| Account Value | $ 21,040 | $ 21,040 | $ 21,040 | 19,155 | 18,187 | 27,867 | 20,163 | 15,932 | 15,510 | 11,576 | 10,072 | 9,972 | 10,000 | |
| Average Annual Return, Percent | 9.84% | 5.72% | 7.72% | |||||||||||
| C000002217 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | I without sales charge | |||||||||||||
| Account Value | $ 23,261 | $ 23,261 | $ 23,261 | 20,967 | 19,712 | 29,891 | 21,417 | 16,755 | 16,148 | 11,934 | 10,278 | 10,074 | 10,000 | |
| Average Annual Return, Percent | 10.94% | 6.78% | 8.81% | |||||||||||
| C000002219 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R1 without sales charge | |||||||||||||
| Account Value | $ 21,046 | $ 21,046 | $ 21,046 | 19,159 | 18,196 | 27,877 | 20,172 | 15,932 | 15,517 | 11,580 | 10,077 | 9,972 | 10,000 | |
| Average Annual Return, Percent | 9.85% | 5.73% | 7.73% | |||||||||||
| C000002221 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R2 without sales charge | |||||||||||||
| Account Value | $ 22,126 | $ 22,126 | $ 22,126 | 20,049 | 18,941 | 28,864 | 20,789 | 16,336 | 15,827 | 11,755 | 10,178 | 10,023 | 10,000 | |
| Average Annual Return, Percent | 10.36% | 6.25% | 8.27% | |||||||||||
| C000002222 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R3 without sales charge | |||||||||||||
| Account Value | $ 22,680 | $ 22,680 | $ 22,680 | 20,487 | 19,315 | 29,363 | 21,094 | 16,536 | 15,984 | 11,841 | 10,225 | 10,047 | 10,000 | |
| Average Annual Return, Percent | 10.70% | 6.52% | 8.53% | |||||||||||
| C000002211 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R4 without sales charge | |||||||||||||
| Account Value | $ 23,272 | $ 23,272 | $ 23,272 | 20,976 | 19,721 | 29,906 | 21,426 | 16,760 | 16,159 | 11,928 | 10,274 | 10,069 | 10,000 | |
| Average Annual Return, Percent | 10.95% | 6.79% | 8.81% | |||||||||||
| C000075013 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R6 without sales charge | |||||||||||||
| Account Value | $ 23,521 | $ 23,521 | $ 23,521 | 21,170 | 19,884 | 30,117 | 21,554 | 16,843 | 16,220 | 11,975 | 10,300 | 10,085 | 10,000 | |
| Average Annual Return, Percent | 11.10% | 6.91% | 8.93% | |||||||||||
| C000002223 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A with initial sales charge (5.75%) | |||||||||||||
| Average Annual Return, Percent | 9.65% | 6.84% | 4.49% | |||||||||||
| C000002223 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A without sales charge | |||||||||||||
| Account Value | $ 15,519 | $ 15,519 | $ 15,519 | 13,339 | 11,731 | 14,914 | 12,000 | 10,509 | 10,704 | 10,023 | 8,592 | 8,723 | 9,425 | |
| Average Annual Return, Percent | 16.34% | 8.11% | 5.11% | |||||||||||
| C000002228 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B with CDSC (declining over six years from 4% to 0%) | |||||||||||||
| Average Annual Return, Percent | [5] | 11.46% | 7% | 4.32% | ||||||||||
| C000002228 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B without sales charge | |||||||||||||
| Account Value | $ 15,270 | $ 15,270 | $ 15,270 | 13,226 | 11,719 | 15,013 | 12,171 | 10,735 | 11,025 | 10,400 | 8,983 | 9,185 | 10,000 | |
| Average Annual Return, Percent | 15.46% | 7.30% | 4.32% | |||||||||||
| C000002229 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C with CDSC (1% for 12 months) | |||||||||||||
| Average Annual Return, Percent | [6] | 14.48% | 7.30% | 4.32% | ||||||||||
| C000002229 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C without sales charge | |||||||||||||
| Account Value | $ 15,270 | $ 15,270 | $ 15,270 | 13,222 | 11,718 | 15,013 | 12,172 | 10,738 | 11,020 | 10,399 | 8,985 | 9,183 | 10,000 | |
| Average Annual Return, Percent | 15.48% | 7.30% | 4.32% | |||||||||||
| C000002230 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | I without sales charge | |||||||||||||
| Account Value | $ 16,884 | $ 16,884 | $ 16,884 | 14,471 | 12,696 | 16,107 | 12,925 | 11,290 | 11,475 | 10,719 | 9,166 | 9,281 | 10,000 | |
| Average Annual Return, Percent | 16.67% | 8.38% | 5.38% | |||||||||||
| C000002232 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R1 without sales charge | |||||||||||||
| Account Value | $ 15,264 | $ 15,264 | $ 15,264 | 13,224 | 11,715 | 15,018 | 12,172 | 10,733 | 11,022 | 10,400 | 8,982 | 9,182 | 10,000 | |
| Average Annual Return, Percent | 15.43% | 7.30% | 4.32% | |||||||||||
| C000002234 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R2 without sales charge | |||||||||||||
| Account Value | $ 16,056 | $ 16,056 | $ 16,056 | 13,840 | 12,198 | 15,555 | 12,542 | 11,006 | 11,247 | 10,561 | 9,076 | 9,232 | 10,000 | |
| Average Annual Return, Percent | 16.01% | 7.84% | 4.85% | |||||||||||
| C000002235 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R3 without sales charge | |||||||||||||
| Account Value | $ 16,469 | $ 16,469 | $ 16,469 | 14,155 | 12,448 | 15,831 | 12,736 | 11,151 | 11,359 | 10,640 | 9,120 | 9,256 | 10,000 | |
| Average Annual Return, Percent | 16.34% | 8.11% | 5.12% | |||||||||||
| C000002190 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A with initial sales charge (5.75%) | |||||||||||||
| Average Annual Return, Percent | 16.80% | 12.60% | 11.48% | |||||||||||
| C000002190 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A without sales charge | |||||||||||||
| Account Value | $ 29,634 | $ 29,634 | $ 29,634 | 23,913 | 21,168 | 24,293 | 18,605 | 15,428 | 14,702 | 12,262 | 10,382 | 9,518 | 9,425 | |
| Average Annual Return, Percent | 23.92% | 13.94% | 12.14% | |||||||||||
| C000002192 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B with CDSC (declining over six years from 4% to 0%) | |||||||||||||
| Average Annual Return, Percent | [7] | 19% | 12.85% | 11.30% | ||||||||||
| C000002192 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B without sales charge | |||||||||||||
| Account Value | $ 29,169 | $ 29,169 | $ 29,169 | 23,715 | 21,148 | 24,453 | 18,871 | 15,767 | 15,137 | 12,720 | 10,852 | 10,025 | 10,000 | |
| Average Annual Return, Percent | 23% | 13.09% | 11.30% | |||||||||||
| C000002193 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C with CDSC (1% for 12 months) | |||||||||||||
| Average Annual Return, Percent | [8] | 21.96% | 13.09% | 11.29% | ||||||||||
| C000002193 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C without sales charge | |||||||||||||
| Account Value | $ 29,157 | $ 29,157 | $ 29,157 | 23,712 | 21,139 | 24,450 | 18,863 | 15,763 | 15,136 | 12,721 | 10,852 | 10,026 | 10,000 | |
| Average Annual Return, Percent | 22.96% | 13.09% | 11.29% | |||||||||||
| C000002194 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | I without sales charge | |||||||||||||
| Account Value | $ 32,226 | $ 32,226 | $ 32,226 | 25,940 | 22,901 | 26,222 | 20,030 | 16,570 | 15,755 | 13,106 | 11,071 | 10,123 | 10,000 | |
| Average Annual Return, Percent | 24.23% | 14.23% | 12.41% | |||||||||||
| C000002196 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R1 without sales charge | |||||||||||||
| Account Value | $ 29,163 | $ 29,163 | $ 29,163 | 23,711 | 21,143 | 24,448 | 18,864 | 15,762 | 15,135 | 12,718 | 10,853 | 10,022 | 10,000 | |
| Average Annual Return, Percent | 22.99% | 13.10% | 11.30% | |||||||||||
| C000002198 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R2 without sales charge | |||||||||||||
| Account Value | $ 30,685 | $ 30,685 | $ 30,685 | 24,825 | 22,021 | 25,335 | 19,447 | 16,169 | 15,449 | 12,916 | 10,964 | 10,075 | 10,000 | |
| Average Annual Return, Percent | 23.60% | 13.67% | 11.86% | |||||||||||
| C000002199 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R3 without sales charge | |||||||||||||
| Account Value | $ 31,425 | $ 31,425 | $ 31,425 | 25,365 | 22,448 | 25,763 | 19,729 | 16,364 | 15,597 | 13,008 | 11,014 | 10,099 | 10,000 | |
| Average Annual Return, Percent | 23.89% | 13.94% | 12.13% | |||||||||||
| C000002191 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R4 without sales charge | |||||||||||||
| Account Value | $ 32,222 | $ 32,222 | $ 32,222 | 25,940 | 22,899 | 26,221 | 20,029 | 16,568 | 15,752 | 13,106 | 11,069 | 10,122 | 10,000 | |
| Average Annual Return, Percent | 24.22% | 14.23% | 12.41% | |||||||||||
| C000124424 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R6 without sales charge | |||||||||||||
| Account Value | $ 32,512 | $ 32,512 | $ 32,512 | 26,147 | 23,066 | 26,384 | 20,136 | 16,644 | 15,809 | 13,143 | 11,092 | 10,134 | 10,000 | |
| Average Annual Return, Percent | 24.34% | 14.33% | 12.51% | |||||||||||
| C000002224 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R4 without sales charge | |||||||||||||
| Account Value | $ 16,871 | $ 16,871 | $ 16,871 | 14,465 | 12,686 | 16,093 | 12,917 | 11,283 | 11,471 | 10,714 | 9,163 | 9,274 | 10,000 | |
| Average Annual Return, Percent | 16.64% | 8.38% | 5.37% | |||||||||||
| C000034436 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R6 without sales charge | |||||||||||||
| Account Value | $ 17,054 | $ 17,054 | $ 17,054 | 14,608 | 12,796 | 16,217 | 13,001 | 11,344 | 11,515 | 10,749 | 9,182 | 9,287 | 10,000 | |
| Average Annual Return, Percent | 16.74% | 8.50% | 5.48% | |||||||||||
| C000002259 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A with initial sales charge (5.75%) | |||||||||||||
| Average Annual Return, Percent | 14.93% | 9.43% | 8.73% | |||||||||||
| C000002259 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A without sales charge | |||||||||||||
| Account Value | $ 23,104 | $ 23,104 | $ 23,104 | 18,947 | 17,723 | 18,974 | 14,282 | 13,875 | 13,233 | 12,094 | 10,775 | 9,489 | 9,425 | |
| Average Annual Return, Percent | 21.94% | 10.74% | 9.38% | |||||||||||
| C000002264 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B with CDSC (declining over six years from 4% to 0%) | |||||||||||||
| Average Annual Return, Percent | [9] | 17.04% | 9.63% | 8.56% | ||||||||||
| C000002264 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B without sales charge | |||||||||||||
| Account Value | $ 22,744 | $ 22,744 | $ 22,744 | 18,790 | 17,714 | 19,106 | 14,488 | 14,184 | 13,628 | 12,546 | 11,262 | 9,994 | 10,000 | |
| Average Annual Return, Percent | 21.04% | 9.90% | 8.56% | |||||||||||
| C000002265 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C with CDSC (1% for 12 months) | |||||||||||||
| Average Annual Return, Percent | [10] | 20.02% | 9.90% | 8.56% | ||||||||||
| C000002265 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C without sales charge | |||||||||||||
| Account Value | $ 22,738 | $ 22,738 | $ 22,738 | 18,788 | 17,707 | 19,100 | 14,485 | 14,181 | 13,623 | 12,546 | 11,259 | 9,991 | 10,000 | |
| Average Annual Return, Percent | 21.02% | 9.90% | 8.56% | |||||||||||
| C000002266 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | I without sales charge | |||||||||||||
| Account Value | $ 25,132 | $ 25,132 | $ 25,132 | 20,559 | 19,186 | 20,488 | 15,382 | 14,907 | 14,183 | 12,929 | 11,488 | 10,093 | 10,000 | |
| Average Annual Return, Percent | 22.24% | 11.01% | 9.65% | |||||||||||
| C000002268 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R1 without sales charge | |||||||||||||
| Account Value | $ 22,739 | $ 22,739 | $ 22,739 | 18,787 | 17,710 | 19,100 | 14,483 | 14,178 | 13,626 | 12,546 | 11,262 | 9,993 | 10,000 | |
| Average Annual Return, Percent | 21.04% | 9.91% | 8.56% | |||||||||||
| C000002270 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R2 without sales charge | |||||||||||||
| Account Value | $ 23,905 | $ 23,905 | $ 23,905 | 19,651 | 18,431 | 19,782 | 14,926 | 14,539 | 13,899 | 12,734 | 11,375 | 10,043 | 10,000 | |
| Average Annual Return, Percent | 21.65% | 10.46% | 9.11% | |||||||||||
| C000002271 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R3 without sales charge | |||||||||||||
| Account Value | $ 24,510 | $ 24,510 | $ 24,510 | 20,099 | 18,802 | 20,131 | 15,153 | 14,724 | 14,040 | 12,830 | 11,432 | 10,069 | 10,000 | |
| Average Annual Return, Percent | 21.95% | 10.73% | 9.38% | |||||||||||
| C000002260 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R4 without sales charge | |||||||||||||
| Account Value | $ 25,126 | $ 25,126 | $ 25,126 | 20,556 | 19,183 | 20,486 | 15,379 | 14,906 | 14,178 | 12,924 | 11,486 | 10,093 | 10,000 | |
| Average Annual Return, Percent | 22.23% | 11.01% | 9.65% | |||||||||||
| C000033014 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R6 without sales charge | |||||||||||||
| Account Value | $ 25,394 | $ 25,394 | $ 25,394 | 20,753 | 19,345 | 20,636 | 15,477 | 14,984 | 14,241 | 12,969 | 11,512 | 10,104 | 10,000 | |
| Average Annual Return, Percent | 22.36% | 11.13% | 9.77% | |||||||||||
| C000002249 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A with initial sales charge (5.75%) | |||||||||||||
| Average Annual Return, Percent | 30.34% | 15.41% | 16.15% | |||||||||||
| C000002249 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A without sales charge | |||||||||||||
| Account Value | $ 44,707 | $ 44,707 | $ 44,707 | 32,328 | 26,179 | 37,506 | 30,500 | 20,577 | 19,984 | 15,049 | 11,704 | 9,819 | 9,425 | |
| Average Annual Return, Percent | 38.29% | 16.79% | 16.84% | |||||||||||
| C000002251 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B with CDSC (declining over six years from 4% to 0%) | |||||||||||||
| Average Annual Return, Percent | [11] | 33.23% | 15.69% | 15.97% | ||||||||||
| C000002251 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B without sales charge | |||||||||||||
| Account Value | $ 43,995 | $ 43,995 | $ 43,995 | 32,059 | 26,150 | 37,752 | 30,928 | 21,029 | 20,575 | 15,610 | 12,233 | 10,341 | 10,000 | |
| Average Annual Return, Percent | 37.23% | 15.91% | 15.97% | |||||||||||
| C000002252 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C with CDSC (1% for 12 months) | |||||||||||||
| Average Annual Return, Percent | [12] | 36.22% | 15.91% | 15.97% | ||||||||||
| C000002252 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C without sales charge | |||||||||||||
| Account Value | $ 43,990 | $ 43,990 | $ 43,990 | 32,058 | 26,153 | 37,753 | 30,931 | 21,026 | 20,576 | 15,611 | 12,233 | 10,342 | 10,000 | |
| Average Annual Return, Percent | 37.22% | 15.91% | 15.97% | |||||||||||
| C000002253 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | I without sales charge | |||||||||||||
| Account Value | $ 48,627 | $ 48,627 | $ 48,627 | 35,077 | 28,335 | 40,491 | 32,844 | 22,107 | 21,421 | 16,090 | 12,482 | 10,449 | 10,000 | |
| Average Annual Return, Percent | 38.63% | 17.08% | 17.14% | |||||||||||
| C000002255 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R1 without sales charge | |||||||||||||
| Account Value | $ 44,003 | $ 44,003 | $ 44,003 | 32,055 | 26,156 | 37,752 | 30,932 | 21,028 | 20,577 | 15,612 | 12,232 | 10,343 | 10,000 | |
| Average Annual Return, Percent | 37.27% | 15.91% | 15.97% | |||||||||||
| C000002257 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R2 without sales charge | |||||||||||||
| Account Value | $ 46,239 | $ 46,239 | $ 46,239 | 33,525 | 27,215 | 39,091 | 31,867 | 21,555 | 20,991 | 15,847 | 12,355 | 10,393 | 10,000 | |
| Average Annual Return, Percent | 37.92% | 16.49% | 16.55% | |||||||||||
| C000002258 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R3 without sales charge | |||||||||||||
| Account Value | $ 47,420 | $ 47,420 | $ 47,420 | 34,297 | 27,769 | 39,788 | 32,352 | 21,833 | 21,203 | 15,970 | 12,419 | 10,418 | 10,000 | |
| Average Annual Return, Percent | 38.26% | 16.78% | 16.84% | |||||||||||
| C000002250 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R4 without sales charge | |||||||||||||
| Account Value | $ 48,606 | $ 48,606 | $ 48,606 | 35,068 | 28,325 | 40,479 | 32,835 | 22,100 | 21,410 | 16,083 | 12,475 | 10,444 | 10,000 | |
| Average Annual Return, Percent | 38.60% | 17.07% | 17.13% | |||||||||||
| C000124425 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R6 without sales charge | |||||||||||||
| Account Value | $ 49,108 | $ 49,108 | $ 49,108 | 35,392 | 28,561 | 40,773 | 33,045 | 22,221 | 21,506 | 16,141 | 12,510 | 10,461 | 10,000 | |
| Average Annual Return, Percent | 38.76% | 17.19% | 17.25% | |||||||||||
| C000132022 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A with initial sales charge (5.75%) | |||||||||||||
| Average Annual Return, Percent | 16.54% | 8.30% | 7.77% | |||||||||||
| C000132022 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A without sales charge | |||||||||||||
| Account Value | $ 21,125 | $ 21,125 | $ 21,125 | 17,085 | 15,437 | 17,030 | 13,978 | 13,364 | 12,563 | 11,507 | 10,530 | 9,391 | 9,425 | |
| Average Annual Return, Percent | 23.65% | 9.59% | 8.41% | |||||||||||
| C000132023 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B with CDSC (declining over six years from 4% to 0%) | |||||||||||||
| Average Annual Return, Percent | [13] | 18.73% | 8.49% | 7.58% | ||||||||||
| C000132023 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B without sales charge | |||||||||||||
| Account Value | $ 20,765 | $ 20,765 | $ 20,765 | 16,920 | 15,396 | 17,112 | 14,157 | 13,637 | 12,914 | 11,930 | 10,998 | 9,894 | 10,000 | |
| Average Annual Return, Percent | 22.73% | 8.77% | 7.58% | |||||||||||
| C000132024 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C with CDSC (1% for 12 months) | |||||||||||||
| Average Annual Return, Percent | [14] | 21.73% | 8.78% | 7.58% | ||||||||||
| C000132024 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C without sales charge | |||||||||||||
| Account Value | $ 20,773 | $ 20,773 | $ 20,773 | 16,926 | 15,403 | 17,122 | 14,151 | 13,637 | 12,917 | 11,929 | 10,995 | 9,886 | 10,000 | |
| Average Annual Return, Percent | 22.73% | 8.78% | 7.58% | |||||||||||
| C000132025 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | I without sales charge | |||||||||||||
| Account Value | $ 22,959 | $ 22,959 | $ 22,959 | 18,524 | 16,685 | 18,372 | 15,033 | 14,338 | 13,449 | 12,300 | 11,224 | 9,991 | 10,000 | |
| Average Annual Return, Percent | 23.94% | 9.87% | 8.67% | |||||||||||
| C000132026 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R1 without sales charge | |||||||||||||
| Account Value | $ 20,770 | $ 20,770 | $ 20,770 | 16,922 | 15,409 | 17,121 | 14,153 | 13,643 | 12,918 | 11,929 | 10,998 | 9,887 | 10,000 | |
| Average Annual Return, Percent | 22.74% | 8.77% | 7.58% | |||||||||||
| C000132027 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R2 without sales charge | |||||||||||||
| Account Value | $ 21,835 | $ 21,835 | $ 21,835 | 17,704 | 16,028 | 17,735 | 14,590 | 13,984 | 13,182 | 12,108 | 11,114 | 9,938 | 10,000 | |
| Average Annual Return, Percent | 23.33% | 9.32% | 8.12% | |||||||||||
| C000132028 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R3 without sales charge | |||||||||||||
| Account Value | $ 22,398 | $ 22,398 | $ 22,398 | 18,111 | 16,357 | 18,043 | 14,813 | 14,164 | 13,310 | 12,199 | 11,167 | 9,966 | 10,000 | |
| Average Annual Return, Percent | 23.67% | 9.60% | 8.40% | |||||||||||
| C000132029 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R4 without sales charge | |||||||||||||
| Account Value | $ 22,943 | $ 22,943 | $ 22,943 | 18,501 | 16,677 | 18,351 | 15,015 | 14,321 | 13,433 | 12,286 | 11,211 | 9,982 | 10,000 | |
| Average Annual Return, Percent | 24.01% | 9.88% | 8.66% | |||||||||||
| C000132030 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R6 without sales charge | |||||||||||||
| Account Value | $ 23,094 | $ 23,094 | $ 23,094 | 18,612 | 16,761 | 18,430 | 15,076 | 14,366 | 13,466 | 12,307 | 11,227 | 9,991 | 10,000 | |
| Average Annual Return, Percent | 24.08% | 9.96% | 8.73% | |||||||||||
| Standard And Poor s 500 Stock Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Standard & Poor's 500 Stock Index | |||||||||||||
| Account Value | $ 33,882 | $ 33,882 | $ 33,882 | 26,650 | 22,986 | 25,893 | 19,740 | 16,189 | 15,730 | 13,145 | 11,309 | 10,048 | 10,000 | |
| Average Annual Return, Percent | [15] | 27.14% | 15.92% | 12.98% | ||||||||||
| Russell 3000 Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Russell 3000® Index | |||||||||||||
| Account Value | $ 32,071 | $ 32,071 | $ 32,071 | 25,424 | 22,155 | 25,548 | 19,203 | 15,813 | 15,608 | 12,980 | 11,184 | 10,036 | 10,000 | |
| Average Annual Return, Percent | [16],[17],[18] | 26.14% | 15.19% | 12.36% | ||||||||||
| MSCI EAFE Europe Australasia Far East Index net div [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI EAFE (Europe, Australasia, Far East) Index (net div) | |||||||||||||
| Account Value | $ 16,596 | $ 16,596 | $ 16,596 | 13,899 | 11,787 | 14,697 | 11,653 | 10,980 | 11,349 | 10,872 | 9,242 | 9,253 | 10,000 | |
| Average Annual Return, Percent | [19] | 19.40% | 8.61% | 5.20% | ||||||||||
| MSCI All Country World Index net div [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI All Country World Index (net div) | |||||||||||||
| Account Value | $ 23,192 | $ 23,192 | $ 23,192 | 18,788 | 16,488 | 19,601 | 15,237 | 13,077 | 13,113 | 11,770 | 10,050 | 9,371 | 10,000 | |
| Average Annual Return, Percent | [20] | 23.44% | 12.14% | 8.78% | ||||||||||
| Russell 2000 Growth Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Russell 2000® Growth Index | |||||||||||||
| Account Value | $ 22,006 | $ 22,006 | $ 22,006 | 18,701 | 17,514 | 23,433 | 17,280 | 14,734 | 16,559 | 12,668 | 10,884 | 10,511 | 10,000 | |
| Average Annual Return, Percent | [21],[22] | 17.67% | 8.35% | 8.21% | ||||||||||
| Russell 1000 Value Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Russell 1000® Value Index | |||||||||||||
| Account Value | $ 23,360 | $ 23,360 | $ 23,360 | 19,282 | 17,756 | 18,935 | 13,877 | 13,762 | 13,677 | 12,161 | 10,899 | 9,652 | 10,000 | |
| Average Annual Return, Percent | [16],[18] | 21.15% | 11.16% | 8.85% | ||||||||||
| Standard And Poor s North American Technology Sector Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Standard & Poor's North American Technology Sector Index | |||||||||||||
| Account Value | $ 61,938 | $ 61,938 | $ 61,938 | $ 45,052 | $ 34,492 | $ 46,629 | $ 35,237 | $ 23,206 | $ 22,254 | $ 16,113 | $ 12,465 | $ 10,372 | $ 10,000 | |
| Average Annual Return, Percent | [23] | 37.48% | 21.69% | 20% | ||||||||||
| [1]Assuming redemption at the end of the applicable period.[2]Assuming redemption at the end of the applicable period.[3]Assuming redemption at the end of the applicable period.[4]Assuming redemption at the end of the applicable period.[5]Assuming redemption at the end of the applicable period.[6]Assuming redemption at the end of the applicable period.[7]Assuming redemption at the end of the applicable period.[8]Assuming redemption at the end of the applicable period.[9]Assuming redemption at the end of the applicable period.[10]Assuming redemption at the end of the applicable period.[11]Assuming redemption at the end of the applicable period.[12]Assuming redemption at the end of the applicable period.[13]Assuming redemption at the end of the applicable period.[14]Assuming redemption at the end of the applicable period.[15]Source: FactSet Research Systems Inc.[16]Effective May 1, 2024, the Russell 3000 ® ® ® ® ® ® ® ® ® | ||||||||||||||
| Shareholder Report, Holdings (Details) | Aug. 31, 2024 |
| C000132013 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132013 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132013 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132013 [Member] | Amphenol Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132013 [Member] | TE Connectivity Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132013 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132013 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132013 [Member] | Merck And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132013 [Member] | Cognizant Technology Solutions Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132013 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132013 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000132013 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000132013 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000132013 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000132013 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000132013 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132013 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000132013 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000132013 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.30% |
| C000132013 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000132013 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132013 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.80% |
| C000132013 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000132014 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132014 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132014 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132014 [Member] | Amphenol Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132014 [Member] | TE Connectivity Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132014 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132014 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132014 [Member] | Merck And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132014 [Member] | Cognizant Technology Solutions Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132014 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132014 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000132014 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000132014 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000132014 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000132014 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000132014 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132014 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000132014 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000132014 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.30% |
| C000132014 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000132014 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132014 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.80% |
| C000132014 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000132015 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132015 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132015 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132015 [Member] | Amphenol Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132015 [Member] | TE Connectivity Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132015 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132015 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132015 [Member] | Merck And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132015 [Member] | Cognizant Technology Solutions Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132015 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132015 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000132015 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000132015 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000132015 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000132015 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000132015 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132015 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000132015 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000132015 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.30% |
| C000132015 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000132015 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132015 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.80% |
| C000132015 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000132016 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132016 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132016 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132016 [Member] | Amphenol Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132016 [Member] | TE Connectivity Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132016 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132016 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132016 [Member] | Merck And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132016 [Member] | Cognizant Technology Solutions Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132016 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132016 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000132016 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000132016 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000132016 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000132016 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000132016 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132016 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000132016 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000132016 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.30% |
| C000132016 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000132016 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132016 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.80% |
| C000132016 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000132017 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132017 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132017 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132017 [Member] | Amphenol Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132017 [Member] | TE Connectivity Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132017 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132017 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132017 [Member] | Merck And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132017 [Member] | Cognizant Technology Solutions Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132017 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132017 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000132017 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000132017 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000132017 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000132017 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000132017 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132017 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000132017 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000132017 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.30% |
| C000132017 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000132017 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132017 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.80% |
| C000132017 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000132018 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132018 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132018 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132018 [Member] | Amphenol Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132018 [Member] | TE Connectivity Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132018 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132018 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132018 [Member] | Merck And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132018 [Member] | Cognizant Technology Solutions Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132018 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132018 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000132018 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000132018 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000132018 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000132018 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000132018 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132018 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000132018 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000132018 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.30% |
| C000132018 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000132018 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132018 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.80% |
| C000132018 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000132019 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132019 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132019 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132019 [Member] | Amphenol Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132019 [Member] | TE Connectivity Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132019 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132019 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132019 [Member] | Merck And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132019 [Member] | Cognizant Technology Solutions Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132019 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132019 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000132019 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000132019 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000132019 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000132019 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000132019 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132019 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000132019 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000132019 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.30% |
| C000132019 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000132019 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132019 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.80% |
| C000132019 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000132020 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132020 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132020 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132020 [Member] | Amphenol Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132020 [Member] | TE Connectivity Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132020 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132020 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132020 [Member] | Merck And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132020 [Member] | Cognizant Technology Solutions Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132020 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132020 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000132020 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000132020 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000132020 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000132020 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000132020 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132020 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000132020 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000132020 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.30% |
| C000132020 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000132020 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132020 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.80% |
| C000132020 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000132021 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132021 [Member] | Motorola Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132021 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132021 [Member] | Amphenol Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132021 [Member] | TE Connectivity Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132021 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000132021 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132021 [Member] | Merck And Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132021 [Member] | Cognizant Technology Solutions Corp A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132021 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132021 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000132021 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000132021 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000132021 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000132021 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000132021 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132021 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000132021 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.30% |
| C000132021 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.30% |
| C000132021 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000132021 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000132021 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.80% |
| C000132021 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000002210 [Member] | Summit Materials Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002210 [Member] | Crane Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002210 [Member] | CACI International Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002210 [Member] | U S Foods Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002210 [Member] | RB Global Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002210 [Member] | GFL Environmental Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002210 [Member] | TopBuild Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002210 [Member] | TechnipFMC PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002210 [Member] | nVent Electric PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002210 [Member] | Jacobs Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002210 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000002210 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000002210 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002210 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000002210 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000002210 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000002210 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002210 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002210 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.20% |
| C000002210 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002210 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 96.60% |
| C000002210 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002215 [Member] | Summit Materials Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002215 [Member] | Crane Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002215 [Member] | CACI International Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002215 [Member] | U S Foods Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002215 [Member] | RB Global Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002215 [Member] | GFL Environmental Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002215 [Member] | TopBuild Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002215 [Member] | TechnipFMC PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002215 [Member] | nVent Electric PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002215 [Member] | Jacobs Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002215 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000002215 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000002215 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002215 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000002215 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000002215 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000002215 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002215 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002215 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.20% |
| C000002215 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002215 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 96.60% |
| C000002215 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002216 [Member] | Summit Materials Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002216 [Member] | Crane Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002216 [Member] | CACI International Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002216 [Member] | U S Foods Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002216 [Member] | RB Global Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002216 [Member] | GFL Environmental Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002216 [Member] | TopBuild Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002216 [Member] | TechnipFMC PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002216 [Member] | nVent Electric PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002216 [Member] | Jacobs Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002216 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000002216 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000002216 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002216 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000002216 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000002216 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000002216 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002216 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002216 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.20% |
| C000002216 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002216 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 96.60% |
| C000002216 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002217 [Member] | Summit Materials Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002217 [Member] | Crane Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002217 [Member] | CACI International Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002217 [Member] | U S Foods Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002217 [Member] | RB Global Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002217 [Member] | GFL Environmental Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002217 [Member] | TopBuild Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002217 [Member] | TechnipFMC PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002217 [Member] | nVent Electric PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002217 [Member] | Jacobs Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002217 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000002217 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000002217 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002217 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000002217 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000002217 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000002217 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002217 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002217 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.20% |
| C000002217 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002217 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 96.60% |
| C000002217 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002219 [Member] | Summit Materials Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002219 [Member] | Crane Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002219 [Member] | CACI International Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002219 [Member] | U S Foods Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002219 [Member] | RB Global Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002219 [Member] | GFL Environmental Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002219 [Member] | TopBuild Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002219 [Member] | TechnipFMC PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002219 [Member] | nVent Electric PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002219 [Member] | Jacobs Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002219 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000002219 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000002219 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002219 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000002219 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000002219 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000002219 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002219 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002219 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.20% |
| C000002219 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002219 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 96.60% |
| C000002219 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002221 [Member] | Summit Materials Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002221 [Member] | Crane Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002221 [Member] | CACI International Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002221 [Member] | U S Foods Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002221 [Member] | RB Global Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002221 [Member] | GFL Environmental Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002221 [Member] | TopBuild Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002221 [Member] | TechnipFMC PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002221 [Member] | nVent Electric PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002221 [Member] | Jacobs Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002221 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000002221 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000002221 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002221 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000002221 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000002221 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000002221 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002221 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002221 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.20% |
| C000002221 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002221 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 96.60% |
| C000002221 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002222 [Member] | Summit Materials Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002222 [Member] | Crane Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002222 [Member] | CACI International Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002222 [Member] | U S Foods Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002222 [Member] | RB Global Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002222 [Member] | GFL Environmental Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002222 [Member] | TopBuild Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002222 [Member] | TechnipFMC PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002222 [Member] | nVent Electric PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002222 [Member] | Jacobs Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002222 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000002222 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000002222 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002222 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000002222 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000002222 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000002222 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002222 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002222 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.20% |
| C000002222 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002222 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 96.60% |
| C000002222 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002211 [Member] | Summit Materials Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002211 [Member] | Crane Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002211 [Member] | CACI International Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002211 [Member] | U S Foods Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002211 [Member] | RB Global Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002211 [Member] | GFL Environmental Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000002211 [Member] | TopBuild Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002211 [Member] | TechnipFMC PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002211 [Member] | nVent Electric PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002211 [Member] | Jacobs Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002211 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000002211 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000002211 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002211 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000002211 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000002211 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000002211 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002211 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000002211 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.20% |
| C000002211 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002211 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 96.60% |
| C000002211 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000075013 [Member] | Summit Materials Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000075013 [Member] | Crane Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000075013 [Member] | CACI International Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000075013 [Member] | U S Foods Holding Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000075013 [Member] | RB Global Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000075013 [Member] | GFL Environmental Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000075013 [Member] | TopBuild Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000075013 [Member] | TechnipFMC PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000075013 [Member] | nVent Electric PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000075013 [Member] | Jacobs Solutions Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000075013 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000075013 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000075013 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000075013 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000075013 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000075013 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000075013 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000075013 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000075013 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.20% |
| C000075013 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000075013 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 96.60% |
| C000075013 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002179 [Member] | Zero To 7 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.80% |
| C000002179 [Member] | Eight To 29 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.10% |
| C000002179 [Member] | Thirty To 59 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000002179 [Member] | Sixty To 89 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000002179 [Member] | Ninety To 365 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000002179 [Member] | A One Plus [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 62.40% |
| C000002179 [Member] | A One [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.60% |
| C000002179 [Member] | U S Treasury and U S Government Agency Securities and Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 73.70% |
| C000002179 [Member] | Repurchase Agreements collateralized by U S Treasury and or U S Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.30% |
| C000002182 [Member] | Zero To 7 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.80% |
| C000002182 [Member] | Eight To 29 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.10% |
| C000002182 [Member] | Thirty To 59 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000002182 [Member] | Sixty To 89 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000002182 [Member] | Ninety To 365 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000002182 [Member] | A One Plus [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 62.40% |
| C000002182 [Member] | A One [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.60% |
| C000002182 [Member] | U S Treasury and U S Government Agency Securities and Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 73.70% |
| C000002182 [Member] | Repurchase Agreements collateralized by U S Treasury and or U S Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.30% |
| C000002183 [Member] | Zero To 7 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.80% |
| C000002183 [Member] | Eight To 29 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.10% |
| C000002183 [Member] | Thirty To 59 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000002183 [Member] | Sixty To 89 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000002183 [Member] | Ninety To 365 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000002183 [Member] | A One Plus [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 62.40% |
| C000002183 [Member] | A One [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.60% |
| C000002183 [Member] | U S Treasury and U S Government Agency Securities and Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 73.70% |
| C000002183 [Member] | Repurchase Agreements collateralized by U S Treasury and or U S Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.30% |
| C000206005 [Member] | Zero To 7 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.80% |
| C000206005 [Member] | Eight To 29 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.10% |
| C000206005 [Member] | Thirty To 59 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000206005 [Member] | Sixty To 89 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000206005 [Member] | Ninety To 365 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000206005 [Member] | A One Plus [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 62.40% |
| C000206005 [Member] | A One [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.60% |
| C000206005 [Member] | U S Treasury and U S Government Agency Securities and Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 73.70% |
| C000206005 [Member] | Repurchase Agreements collateralized by U S Treasury and or U S Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.30% |
| C000002184 [Member] | Zero To 7 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.80% |
| C000002184 [Member] | Eight To 29 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.10% |
| C000002184 [Member] | Thirty To 59 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000002184 [Member] | Sixty To 89 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000002184 [Member] | Ninety To 365 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000002184 [Member] | A One Plus [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 62.40% |
| C000002184 [Member] | A One [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.60% |
| C000002184 [Member] | U S Treasury and U S Government Agency Securities and Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 73.70% |
| C000002184 [Member] | Repurchase Agreements collateralized by U S Treasury and or U S Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.30% |
| C000002186 [Member] | Zero To 7 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.80% |
| C000002186 [Member] | Eight To 29 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.10% |
| C000002186 [Member] | Thirty To 59 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000002186 [Member] | Sixty To 89 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000002186 [Member] | Ninety To 365 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000002186 [Member] | A One Plus [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 62.40% |
| C000002186 [Member] | A One [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.60% |
| C000002186 [Member] | U S Treasury and U S Government Agency Securities and Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 73.70% |
| C000002186 [Member] | Repurchase Agreements collateralized by U S Treasury and or U S Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.30% |
| C000002187 [Member] | Zero To 7 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.80% |
| C000002187 [Member] | Eight To 29 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.10% |
| C000002187 [Member] | Thirty To 59 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000002187 [Member] | Sixty To 89 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000002187 [Member] | Ninety To 365 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000002187 [Member] | A One Plus [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 62.40% |
| C000002187 [Member] | A One [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.60% |
| C000002187 [Member] | U S Treasury and U S Government Agency Securities and Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 73.70% |
| C000002187 [Member] | Repurchase Agreements collateralized by U S Treasury and or U S Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.30% |
| C000002188 [Member] | Zero To 7 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.80% |
| C000002188 [Member] | Eight To 29 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.10% |
| C000002188 [Member] | Thirty To 59 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000002188 [Member] | Sixty To 89 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000002188 [Member] | Ninety To 365 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000002188 [Member] | A One Plus [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 62.40% |
| C000002188 [Member] | A One [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.60% |
| C000002188 [Member] | U S Treasury and U S Government Agency Securities and Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 73.70% |
| C000002188 [Member] | Repurchase Agreements collateralized by U S Treasury and or U S Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.30% |
| C000206004 [Member] | Zero To 7 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 31.80% |
| C000206004 [Member] | Eight To 29 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.10% |
| C000206004 [Member] | Thirty To 59 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.80% |
| C000206004 [Member] | Sixty To 89 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000206004 [Member] | Ninety To 365 days [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000206004 [Member] | A One Plus [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 62.40% |
| C000206004 [Member] | A One [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.60% |
| C000206004 [Member] | U S Treasury and U S Government Agency Securities and Equivalents [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 73.70% |
| C000206004 [Member] | Repurchase Agreements collateralized by U S Treasury and or U S Government Agency Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.30% |
| C000002223 [Member] | Novo Nordisk A S B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002223 [Member] | Schneider Electric SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002223 [Member] | Linde PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002223 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002223 [Member] | ASML Holding N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002223 [Member] | Hitachi Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002223 [Member] | Nestle S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002223 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002223 [Member] | TotalEnergies SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002223 [Member] | NatWest Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000002223 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000002223 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000002223 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.80% |
| C000002223 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000002223 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002223 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000002223 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000002223 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002223 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000002223 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000002223 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000002223 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002228 [Member] | Novo Nordisk A S B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002228 [Member] | Schneider Electric SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002228 [Member] | Linde PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002228 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002228 [Member] | ASML Holding N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002228 [Member] | Hitachi Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002228 [Member] | Nestle S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002228 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002228 [Member] | TotalEnergies SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002228 [Member] | NatWest Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000002228 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000002228 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000002228 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.80% |
| C000002228 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000002228 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002228 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000002228 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000002228 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002228 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000002228 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000002228 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000002228 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002229 [Member] | Novo Nordisk A S B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002229 [Member] | Schneider Electric SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002229 [Member] | Linde PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002229 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002229 [Member] | ASML Holding N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002229 [Member] | Hitachi Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002229 [Member] | Nestle S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002229 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002229 [Member] | TotalEnergies SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002229 [Member] | NatWest Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000002229 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000002229 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000002229 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.80% |
| C000002229 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000002229 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002229 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000002229 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000002229 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002229 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000002229 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000002229 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000002229 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002230 [Member] | Novo Nordisk A S B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002230 [Member] | Schneider Electric SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002230 [Member] | Linde PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002230 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002230 [Member] | ASML Holding N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002230 [Member] | Hitachi Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002230 [Member] | Nestle S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002230 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002230 [Member] | TotalEnergies SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002230 [Member] | NatWest Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000002230 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000002230 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000002230 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.80% |
| C000002230 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000002230 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002230 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000002230 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000002230 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002230 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000002230 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000002230 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000002230 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002232 [Member] | Novo Nordisk A S B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002232 [Member] | Schneider Electric SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002232 [Member] | Linde PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002232 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002232 [Member] | ASML Holding N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002232 [Member] | Hitachi Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002232 [Member] | Nestle S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002232 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002232 [Member] | TotalEnergies SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002232 [Member] | NatWest Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000002232 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000002232 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000002232 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.80% |
| C000002232 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000002232 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002232 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000002232 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000002232 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002232 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000002232 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000002232 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000002232 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002234 [Member] | Novo Nordisk A S B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002234 [Member] | Schneider Electric SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002234 [Member] | Linde PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002234 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002234 [Member] | ASML Holding N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002234 [Member] | Hitachi Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002234 [Member] | Nestle S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002234 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002234 [Member] | TotalEnergies SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002234 [Member] | NatWest Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000002234 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000002234 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000002234 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.80% |
| C000002234 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000002234 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002234 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000002234 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000002234 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002234 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000002234 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000002234 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000002234 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002235 [Member] | Novo Nordisk A S B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002235 [Member] | Schneider Electric SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002235 [Member] | Linde PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002235 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002235 [Member] | ASML Holding N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002235 [Member] | Hitachi Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002235 [Member] | Nestle S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002235 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002235 [Member] | TotalEnergies SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002235 [Member] | NatWest Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000002235 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000002235 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000002235 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.80% |
| C000002235 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000002235 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002235 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000002235 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000002235 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002235 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000002235 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000002235 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000002235 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002190 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002190 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000002190 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002190 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002190 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002190 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002190 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002190 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002190 [Member] | Exxon Mobil Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002190 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002190 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000002190 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000002190 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000002190 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002190 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.40% |
| C000002190 [Member] | Consumer Cyclicals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000002190 [Member] | Telecommunications and Cable Television [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002190 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002190 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002190 [Member] | Securities Sold Short [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | (0.10%) |
| C000002190 [Member] | Capital Goods [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000002192 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002192 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000002192 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002192 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002192 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002192 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002192 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002192 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002192 [Member] | Exxon Mobil Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002192 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002192 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000002192 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000002192 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000002192 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002192 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.40% |
| C000002192 [Member] | Consumer Cyclicals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000002192 [Member] | Telecommunications and Cable Television [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002192 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002192 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002192 [Member] | Securities Sold Short [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | (0.10%) |
| C000002192 [Member] | Capital Goods [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000002193 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002193 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000002193 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002193 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002193 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002193 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002193 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002193 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002193 [Member] | Exxon Mobil Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002193 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002193 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000002193 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000002193 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000002193 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002193 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.40% |
| C000002193 [Member] | Consumer Cyclicals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000002193 [Member] | Telecommunications and Cable Television [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002193 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002193 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002193 [Member] | Securities Sold Short [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | (0.10%) |
| C000002193 [Member] | Capital Goods [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000002194 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002194 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000002194 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002194 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002194 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002194 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002194 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002194 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002194 [Member] | Exxon Mobil Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002194 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002194 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000002194 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000002194 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000002194 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002194 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.40% |
| C000002194 [Member] | Consumer Cyclicals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000002194 [Member] | Telecommunications and Cable Television [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002194 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002194 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002194 [Member] | Securities Sold Short [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | (0.10%) |
| C000002194 [Member] | Capital Goods [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000002196 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002196 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000002196 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002196 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002196 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002196 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002196 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002196 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002196 [Member] | Exxon Mobil Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002196 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002196 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000002196 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000002196 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000002196 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002196 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.40% |
| C000002196 [Member] | Consumer Cyclicals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000002196 [Member] | Telecommunications and Cable Television [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002196 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002196 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002196 [Member] | Securities Sold Short [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | (0.10%) |
| C000002196 [Member] | Capital Goods [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000002198 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002198 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000002198 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002198 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002198 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002198 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002198 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002198 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002198 [Member] | Exxon Mobil Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002198 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002198 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000002198 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000002198 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000002198 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002198 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.40% |
| C000002198 [Member] | Consumer Cyclicals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000002198 [Member] | Telecommunications and Cable Television [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002198 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002198 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002198 [Member] | Securities Sold Short [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | (0.10%) |
| C000002198 [Member] | Capital Goods [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000002199 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002199 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000002199 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002199 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002199 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002199 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002199 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002199 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002199 [Member] | Exxon Mobil Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002199 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002199 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000002199 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000002199 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000002199 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002199 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.40% |
| C000002199 [Member] | Consumer Cyclicals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000002199 [Member] | Telecommunications and Cable Television [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002199 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002199 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002199 [Member] | Securities Sold Short [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | (0.10%) |
| C000002199 [Member] | Capital Goods [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000002191 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002191 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000002191 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002191 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000002191 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000002191 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002191 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002191 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002191 [Member] | Exxon Mobil Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002191 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002191 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000002191 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000002191 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000002191 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002191 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.40% |
| C000002191 [Member] | Consumer Cyclicals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000002191 [Member] | Telecommunications and Cable Television [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000002191 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002191 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002191 [Member] | Securities Sold Short [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | (0.10%) |
| C000002191 [Member] | Capital Goods [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000124424 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000124424 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000124424 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000124424 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| C000124424 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000124424 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000124424 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000124424 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000124424 [Member] | Exxon Mobil Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000124424 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000124424 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000124424 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000124424 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.10% |
| C000124424 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000124424 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.40% |
| C000124424 [Member] | Consumer Cyclicals [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.70% |
| C000124424 [Member] | Telecommunications and Cable Television [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000124424 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000124424 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000124424 [Member] | Securities Sold Short [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | (0.10%) |
| C000124424 [Member] | Capital Goods [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| C000002224 [Member] | Novo Nordisk A S B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002224 [Member] | Schneider Electric SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002224 [Member] | Linde PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002224 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002224 [Member] | ASML Holding N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002224 [Member] | Hitachi Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002224 [Member] | Nestle S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002224 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002224 [Member] | TotalEnergies SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000002224 [Member] | NatWest Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000002224 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000002224 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000002224 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.80% |
| C000002224 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000002224 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002224 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000002224 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000002224 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000002224 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000002224 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000002224 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000002224 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000034436 [Member] | Novo Nordisk A S B [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000034436 [Member] | Schneider Electric SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000034436 [Member] | Linde PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000034436 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000034436 [Member] | ASML Holding N V [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000034436 [Member] | Hitachi Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000034436 [Member] | Nestle S A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000034436 [Member] | LVMH Moet Hennessy Louis Vuitton SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000034436 [Member] | TotalEnergies SE [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000034436 [Member] | NatWest Group PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000034436 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.80% |
| C000034436 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000034436 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.80% |
| C000034436 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000034436 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000034436 [Member] | GERMANY | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000034436 [Member] | DENMARK | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000034436 [Member] | SPAIN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000034436 [Member] | FRANCE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.10% |
| C000034436 [Member] | NETHERLANDS | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000034436 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000034436 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002259 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002259 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002259 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002259 [Member] | Progressive Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000002259 [Member] | Cigna Group [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002259 [Member] | Marsh And McLennan Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002259 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002259 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002259 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000002259 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002259 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000002259 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000002259 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15% |
| C000002259 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002259 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000002259 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002259 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000002259 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.60% |
| C000002259 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002259 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000002259 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002259 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002259 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000002264 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002264 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002264 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002264 [Member] | Progressive Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000002264 [Member] | Cigna Group [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002264 [Member] | Marsh And McLennan Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002264 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002264 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002264 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000002264 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002264 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000002264 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000002264 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15% |
| C000002264 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002264 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000002264 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002264 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000002264 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.60% |
| C000002264 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002264 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000002264 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002264 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002264 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000002265 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002265 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002265 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002265 [Member] | Progressive Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000002265 [Member] | Cigna Group [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002265 [Member] | Marsh And McLennan Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002265 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002265 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002265 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000002265 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002265 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000002265 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000002265 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15% |
| C000002265 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002265 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000002265 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002265 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000002265 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.60% |
| C000002265 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002265 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000002265 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002265 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002265 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000002266 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002266 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002266 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002266 [Member] | Progressive Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000002266 [Member] | Cigna Group [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002266 [Member] | Marsh And McLennan Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002266 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002266 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002266 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000002266 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002266 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000002266 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000002266 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15% |
| C000002266 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002266 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000002266 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002266 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000002266 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.60% |
| C000002266 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002266 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000002266 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002266 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002266 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000002268 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002268 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002268 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002268 [Member] | Progressive Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000002268 [Member] | Cigna Group [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002268 [Member] | Marsh And McLennan Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002268 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002268 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002268 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000002268 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002268 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000002268 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000002268 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15% |
| C000002268 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002268 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000002268 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002268 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000002268 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.60% |
| C000002268 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002268 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000002268 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002268 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002268 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000002270 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002270 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002270 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002270 [Member] | Progressive Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000002270 [Member] | Cigna Group [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002270 [Member] | Marsh And McLennan Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002270 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002270 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002270 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000002270 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002270 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000002270 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000002270 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15% |
| C000002270 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002270 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000002270 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002270 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000002270 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.60% |
| C000002270 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002270 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000002270 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002270 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002270 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000002271 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002271 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002271 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002271 [Member] | Progressive Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000002271 [Member] | Cigna Group [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002271 [Member] | Marsh And McLennan Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002271 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002271 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002271 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000002271 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002271 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000002271 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000002271 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15% |
| C000002271 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002271 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000002271 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002271 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000002271 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.60% |
| C000002271 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002271 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000002271 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002271 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002271 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000002260 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002260 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002260 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002260 [Member] | Progressive Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000002260 [Member] | Cigna Group [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002260 [Member] | Marsh And McLennan Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002260 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002260 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000002260 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000002260 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002260 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000002260 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000002260 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15% |
| C000002260 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002260 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000002260 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000002260 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000002260 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.60% |
| C000002260 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000002260 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000002260 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002260 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000002260 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000033014 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000033014 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000033014 [Member] | JPMorgan Chase And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000033014 [Member] | Progressive Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000033014 [Member] | Cigna Group [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000033014 [Member] | Marsh And McLennan Cos Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000033014 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000033014 [Member] | ConocoPhillips [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000033014 [Member] | General Dynamics Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000033014 [Member] | American Express Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000033014 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000033014 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.60% |
| C000033014 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15% |
| C000033014 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000033014 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000033014 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000033014 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000033014 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.60% |
| C000033014 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.70% |
| C000033014 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000033014 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000033014 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.50% |
| C000033014 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000002249 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002249 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000002249 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000002249 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002249 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000002249 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000002249 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002249 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000002249 [Member] | ServiceNow Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002249 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002249 [Member] | Computer Software [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.20% |
| C000002249 [Member] | Electronics [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.90% |
| C000002249 [Member] | Internet [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.40% |
| C000002249 [Member] | Computer Software Systems [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000002249 [Member] | Business Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000002249 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.40% |
| C000002249 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002251 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002251 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000002251 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000002251 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002251 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000002251 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000002251 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002251 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000002251 [Member] | ServiceNow Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002251 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002251 [Member] | Computer Software [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.20% |
| C000002251 [Member] | Electronics [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.90% |
| C000002251 [Member] | Internet [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.40% |
| C000002251 [Member] | Computer Software Systems [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000002251 [Member] | Business Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000002251 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.40% |
| C000002251 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002252 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002252 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000002252 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000002252 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002252 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000002252 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000002252 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002252 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000002252 [Member] | ServiceNow Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002252 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002252 [Member] | Computer Software [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.20% |
| C000002252 [Member] | Electronics [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.90% |
| C000002252 [Member] | Internet [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.40% |
| C000002252 [Member] | Computer Software Systems [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000002252 [Member] | Business Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000002252 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.40% |
| C000002252 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002253 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002253 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000002253 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000002253 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002253 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000002253 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000002253 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002253 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000002253 [Member] | ServiceNow Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002253 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002253 [Member] | Computer Software [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.20% |
| C000002253 [Member] | Electronics [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.90% |
| C000002253 [Member] | Internet [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.40% |
| C000002253 [Member] | Computer Software Systems [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000002253 [Member] | Business Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000002253 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.40% |
| C000002253 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002255 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002255 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000002255 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000002255 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002255 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000002255 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000002255 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002255 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000002255 [Member] | ServiceNow Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002255 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002255 [Member] | Computer Software [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.20% |
| C000002255 [Member] | Electronics [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.90% |
| C000002255 [Member] | Internet [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.40% |
| C000002255 [Member] | Computer Software Systems [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000002255 [Member] | Business Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000002255 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.40% |
| C000002255 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002257 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002257 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000002257 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000002257 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002257 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000002257 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000002257 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002257 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000002257 [Member] | ServiceNow Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002257 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002257 [Member] | Computer Software [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.20% |
| C000002257 [Member] | Electronics [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.90% |
| C000002257 [Member] | Internet [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.40% |
| C000002257 [Member] | Computer Software Systems [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000002257 [Member] | Business Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000002257 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.40% |
| C000002257 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002258 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002258 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000002258 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000002258 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002258 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000002258 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000002258 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002258 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000002258 [Member] | ServiceNow Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002258 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002258 [Member] | Computer Software [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.20% |
| C000002258 [Member] | Electronics [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.90% |
| C000002258 [Member] | Internet [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.40% |
| C000002258 [Member] | Computer Software Systems [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000002258 [Member] | Business Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000002258 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.40% |
| C000002258 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002250 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002250 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000002250 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000002250 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000002250 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000002250 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000002250 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000002250 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000002250 [Member] | ServiceNow Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000002250 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000002250 [Member] | Computer Software [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.20% |
| C000002250 [Member] | Electronics [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.90% |
| C000002250 [Member] | Internet [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.40% |
| C000002250 [Member] | Computer Software Systems [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000002250 [Member] | Business Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000002250 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.40% |
| C000002250 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000124425 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000124425 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000124425 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6% |
| C000124425 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.10% |
| C000124425 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| C000124425 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.30% |
| C000124425 [Member] | Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000124425 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000124425 [Member] | ServiceNow Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000124425 [Member] | KLA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000124425 [Member] | Computer Software [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.20% |
| C000124425 [Member] | Electronics [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.90% |
| C000124425 [Member] | Internet [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.40% |
| C000124425 [Member] | Computer Software Systems [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000124425 [Member] | Business Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000124425 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.40% |
| C000124425 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000132022 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132022 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132022 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132022 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132022 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132022 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132022 [Member] | DBS Group Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132022 [Member] | Constellation Software Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132022 [Member] | Jollibee Foods Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132022 [Member] | KDDI Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132022 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132022 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132022 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132022 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000132022 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000132022 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132022 [Member] | PHILIPPINES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132022 [Member] | SINGAPORE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000132022 [Member] | THAILAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132022 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.20% |
| C000132022 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.70% |
| C000132022 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000132023 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132023 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132023 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132023 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132023 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132023 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132023 [Member] | DBS Group Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132023 [Member] | Constellation Software Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132023 [Member] | Jollibee Foods Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132023 [Member] | KDDI Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132023 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132023 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132023 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132023 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000132023 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000132023 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132023 [Member] | PHILIPPINES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132023 [Member] | SINGAPORE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000132023 [Member] | THAILAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132023 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.20% |
| C000132023 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.70% |
| C000132023 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000132024 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132024 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132024 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132024 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132024 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132024 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132024 [Member] | DBS Group Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132024 [Member] | Constellation Software Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132024 [Member] | Jollibee Foods Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132024 [Member] | KDDI Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132024 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132024 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132024 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132024 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000132024 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000132024 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132024 [Member] | PHILIPPINES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132024 [Member] | SINGAPORE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000132024 [Member] | THAILAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132024 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.20% |
| C000132024 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.70% |
| C000132024 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000132025 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132025 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132025 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132025 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132025 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132025 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132025 [Member] | DBS Group Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132025 [Member] | Constellation Software Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132025 [Member] | Jollibee Foods Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132025 [Member] | KDDI Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132025 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132025 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132025 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132025 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000132025 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000132025 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132025 [Member] | PHILIPPINES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132025 [Member] | SINGAPORE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000132025 [Member] | THAILAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132025 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.20% |
| C000132025 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.70% |
| C000132025 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000132026 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132026 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132026 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132026 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132026 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132026 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132026 [Member] | DBS Group Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132026 [Member] | Constellation Software Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132026 [Member] | Jollibee Foods Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132026 [Member] | KDDI Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132026 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132026 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132026 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132026 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000132026 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000132026 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132026 [Member] | PHILIPPINES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132026 [Member] | SINGAPORE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000132026 [Member] | THAILAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132026 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.20% |
| C000132026 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.70% |
| C000132026 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000132027 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132027 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132027 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132027 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132027 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132027 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132027 [Member] | DBS Group Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132027 [Member] | Constellation Software Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132027 [Member] | Jollibee Foods Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132027 [Member] | KDDI Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132027 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132027 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132027 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132027 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000132027 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000132027 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132027 [Member] | PHILIPPINES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132027 [Member] | SINGAPORE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000132027 [Member] | THAILAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132027 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.20% |
| C000132027 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.70% |
| C000132027 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000132028 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132028 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132028 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132028 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132028 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132028 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132028 [Member] | DBS Group Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132028 [Member] | Constellation Software Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132028 [Member] | Jollibee Foods Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132028 [Member] | KDDI Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132028 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132028 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132028 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132028 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000132028 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000132028 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132028 [Member] | PHILIPPINES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132028 [Member] | SINGAPORE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000132028 [Member] | THAILAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132028 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.20% |
| C000132028 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.70% |
| C000132028 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000132029 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132029 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132029 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132029 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132029 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132029 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132029 [Member] | DBS Group Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132029 [Member] | Constellation Software Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132029 [Member] | Jollibee Foods Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132029 [Member] | KDDI Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132029 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132029 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132029 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132029 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000132029 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000132029 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132029 [Member] | PHILIPPINES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132029 [Member] | SINGAPORE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000132029 [Member] | THAILAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132029 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.20% |
| C000132029 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.70% |
| C000132029 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000132030 [Member] | Eli Lilly And Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132030 [Member] | McKesson Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132030 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| C000132030 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132030 [Member] | Roche Holding AG [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132030 [Member] | Colgate Palmolive Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000132030 [Member] | DBS Group Holdings Ltd [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000132030 [Member] | Constellation Software Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000132030 [Member] | Jollibee Foods Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132030 [Member] | KDDI Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000132030 [Member] | Other Countries [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000132030 [Member] | CANADA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000132030 [Member] | SWITZERLAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000132030 [Member] | JAPAN | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000132030 [Member] | KOREA, REPUBLIC OF | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000132030 [Member] | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000132030 [Member] | PHILIPPINES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000132030 [Member] | SINGAPORE | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000132030 [Member] | THAILAND | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000132030 [Member] | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.20% |
| C000132030 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.70% |
| C000132030 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
