| Form N-CSR Cover | 12 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | MFS SERIES TRUST XI |
| Entity Central Index Key | 0000911637 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 12 Months Ended | |
| Sep. 30, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSR | |
| Amendment Flag | false | |
| Registrant Name | MFS SERIES TRUST XI | |
| Entity Central Index Key | 0000911637 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Sep. 30, 2024 | |
| C000006776 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Mid Cap Value Fund | |
| Class Name | Class A | |
| Trading Symbol | MVCAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Mid Cap Value Fund for the period of October 1, 2023 to September 30, 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 $ 0.99 % | |
| Expenses Paid, Amount | $ 114 | |
| Expense Ratio, Percent | 0.99% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class A shares of the MFS Mid Cap Value Fund (fund) provided a total return of 29.60%, at net asset value. This compares with a return of 35.19% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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 Midcap ® Security selection within the information technology, industrials, and materials sectors contributed to relative performance. Top detractors from performance relative to the Russell Midcap ® Security selection within both the consumer discretionary and utilities sectors held back 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 9/30/24 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 29.60 % 11.61 % 9.66 % A with initial sales charge (5.75%) 22.15 % 10.30 % 9.01 % Comparative Benchmark(s) Russell 3000 ® 35.19 % 15.26 % 12.83 % Russell Midcap ® 29.01 % 10.33 % 8.93 % + 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 | $ 17,864,161,011 | |
| Holdings Count | Holding | 145 | |
| Advisory Fees Paid, Amount | $ 96,789,918 | [1] |
| Investment Company Portfolio Turnover | 27% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 17,864,161,011 Total Management Fee ($)#: 96,789,918 Total Number of Holdings: 145 Portfolio Turnover Rate (%): 27 # 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 9/30/24) Portfolio structure Equities 98.3 % Money Market Funds 1.7 % Equity sectors Financials 18.7 % Industrials 18.3 % Consumer Discretionary 9.5 % Materials 8.9 % Utilities 7.9 % Health Care 7.9 % Real Estate 7.4 % Information Technology 7.2 % Consumer Staples 6.6 % Energy 5.2 % Communication Services 0.7 % Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % | |
| C000006781 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Mid Cap Value Fund | |
| Class Name | Class B | |
| Trading Symbol | MCBVX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Mid Cap Value Fund for the period of October 1, 2023 to September 30, 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 $ 1.74 % | |
| Expenses Paid, Amount | $ 199 | |
| Expense Ratio, Percent | 1.74% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class B shares of the MFS Mid Cap Value Fund (fund) provided a total return of 28.63%, at net asset value. This compares with a return of 35.19% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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 Midcap ® Security selection within the information technology, industrials, and materials sectors contributed to relative performance. Top detractors from performance relative to the Russell Midcap ® Security selection within both the consumer discretionary and utilities sectors held back 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 9/30/24 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 28.63 % 10.78 % 8.84 % B with CDSC (declining over six years from 4% to 0%) × 24.63 % 10.51 % 8.84 % Comparative Benchmark(s) Russell 3000 ® 35.19 % 15.26 % 12.83 % Russell Midcap ® 29.01 % 10.33 % 8.93 % + 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 | $ 17,864,161,011 | |
| Holdings Count | Holding | 145 | |
| Advisory Fees Paid, Amount | $ 96,789,918 | [2] |
| Investment Company Portfolio Turnover | 27% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 17,864,161,011 Total Management Fee ($)#: 96,789,918 Total Number of Holdings: 145 Portfolio Turnover Rate (%): 27 # 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 9/30/24) Portfolio structure Equities 98.3 % Money Market Funds 1.7 % Equity sectors Financials 18.7 % Industrials 18.3 % Consumer Discretionary 9.5 % Materials 8.9 % Utilities 7.9 % Health Care 7.9 % Real Estate 7.4 % Information Technology 7.2 % Consumer Staples 6.6 % Energy 5.2 % Communication Services 0.7 % Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % | |
| C000006782 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Mid Cap Value Fund | |
| Class Name | Class C | |
| Trading Symbol | MVCCX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Mid Cap Value Fund for the period of October 1, 2023 to September 30, 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 $ 1.74 % | |
| Expenses Paid, Amount | $ 199 | |
| Expense Ratio, Percent | 1.74% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class C shares of the MFS Mid Cap Value Fund (fund) provided a total return of 28.61%, at net asset value. This compares with a return of 35.19% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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 Midcap ® Security selection within the information technology, industrials, and materials sectors contributed to relative performance. Top detractors from performance relative to the Russell Midcap ® Security selection within both the consumer discretionary and utilities sectors held back 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 9/30/24 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 28.61 % 10.77 % 8.84 % C with CDSC (1% for 12 months) × 27.61 % 10.77 % 8.84 % Comparative Benchmark(s) Russell 3000 ® 35.19 % 15.26 % 12.83 % Russell Midcap ® 29.01 % 10.33 % 8.93 % + 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 | $ 17,864,161,011 | |
| Holdings Count | Holding | 145 | |
| Advisory Fees Paid, Amount | $ 96,789,918 | [3] |
| Investment Company Portfolio Turnover | 27% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 17,864,161,011 Total Management Fee ($)#: 96,789,918 Total Number of Holdings: 145 Portfolio Turnover Rate (%): 27 # 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 9/30/24) Portfolio structure Equities 98.3 % Money Market Funds 1.7 % Equity sectors Financials 18.7 % Industrials 18.3 % Consumer Discretionary 9.5 % Materials 8.9 % Utilities 7.9 % Health Care 7.9 % Real Estate 7.4 % Information Technology 7.2 % Consumer Staples 6.6 % Energy 5.2 % Communication Services 0.7 % Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % | |
| C000006783 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Mid Cap Value Fund | |
| Class Name | Class I | |
| Trading Symbol | MCVIX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Mid Cap Value Fund for the period of October 1, 2023 to September 30, 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 $ 0.74 % | |
| Expenses Paid, Amount | $ 85 | |
| Expense Ratio, Percent | 0.74% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class I shares of the MFS Mid Cap Value Fund (fund) provided a total return of 29.91%, at net asset value. This compares with a return of 35.19% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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 Midcap ® Security selection within the information technology, industrials, and materials sectors contributed to relative performance. Top detractors from performance relative to the Russell Midcap ® Security selection within both the consumer discretionary and utilities sectors held back 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 9/30/24 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 29.91 % 11.89 % 9.93 % Comparative Benchmark(s) Russell 3000 ® 35.19 % 15.26 % 12.83 % Russell Midcap ® 29.01 % 10.33 % 8.93 % + 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 | $ 17,864,161,011 | |
| Holdings Count | Holding | 145 | |
| Advisory Fees Paid, Amount | $ 96,789,918 | [4] |
| Investment Company Portfolio Turnover | 27% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 17,864,161,011 Total Management Fee ($)#: 96,789,918 Total Number of Holdings: 145 Portfolio Turnover Rate (%): 27 # 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 9/30/24) Portfolio structure Equities 98.3 % Money Market Funds 1.7 % Equity sectors Financials 18.7 % Industrials 18.3 % Consumer Discretionary 9.5 % Materials 8.9 % Utilities 7.9 % Health Care 7.9 % Real Estate 7.4 % Information Technology 7.2 % Consumer Staples 6.6 % Energy 5.2 % Communication Services 0.7 % Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % | |
| C000006785 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Mid Cap Value Fund | |
| Class Name | Class R1 | |
| Trading Symbol | MVCGX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Mid Cap Value Fund for the period of October 1, 2023 to September 30, 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 | $ 199 | |
| Expense Ratio, Percent | 1.74% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class R1 shares of the MFS Mid Cap Value Fund (fund) provided a total return of 28.64%, at net asset value. This compares with a return of 35.19% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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 Midcap ® Security selection within the information technology, industrials, and materials sectors contributed to relative performance. Top detractors from performance relative to the Russell Midcap ® Security selection within both the consumer discretionary and utilities sectors held back 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 9/30/24 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 28.64 % 10.77 % 8.84 % Comparative Benchmark(s) Russell 3000 ® 35.19 % 15.26 % 12.83 % Russell Midcap ® 29.01 % 10.33 % 8.93 % + 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 | $ 17,864,161,011 | |
| Holdings Count | Holding | 145 | |
| Advisory Fees Paid, Amount | $ 96,789,918 | [5] |
| Investment Company Portfolio Turnover | 27% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 17,864,161,011 Total Management Fee ($)#: 96,789,918 Total Number of Holdings: 145 Portfolio Turnover Rate (%): 27 # 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 9/30/24) Portfolio structure Equities 98.3 % Money Market Funds 1.7 % Equity sectors Financials 18.7 % Industrials 18.3 % Consumer Discretionary 9.5 % Materials 8.9 % Utilities 7.9 % Health Care 7.9 % Real Estate 7.4 % Information Technology 7.2 % Consumer Staples 6.6 % Energy 5.2 % Communication Services 0.7 % Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % | |
| C000006787 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Mid Cap Value Fund | |
| Class Name | Class R2 | |
| Trading Symbol | MCVRX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Mid Cap Value Fund for the period of October 1, 2023 to September 30, 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 $ 1.24 % | |
| Expenses Paid, Amount | $ 142 | |
| Expense Ratio, Percent | 1.24% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class R2 shares of the MFS Mid Cap Value Fund (fund) provided a total return of 29.26%, at net asset value. This compares with a return of 35.19% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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 Midcap ® Security selection within the information technology, industrials, and materials sectors contributed to relative performance. Top detractors from performance relative to the Russell Midcap ® Security selection within both the consumer discretionary and utilities sectors held back 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 9/30/24 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 29.26 % 11.34 % 9.39 % Comparative Benchmark(s) Russell 3000 ® 35.19 % 15.26 % 12.83 % Russell Midcap ® 29.01 % 10.33 % 8.93 % + 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 | $ 17,864,161,011 | |
| Holdings Count | Holding | 145 | |
| Advisory Fees Paid, Amount | $ 96,789,918 | [6] |
| Investment Company Portfolio Turnover | 27% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 17,864,161,011 Total Management Fee ($)#: 96,789,918 Total Number of Holdings: 145 Portfolio Turnover Rate (%): 27 # 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 9/30/24) Portfolio structure Equities 98.3 % Money Market Funds 1.7 % Equity sectors Financials 18.7 % Industrials 18.3 % Consumer Discretionary 9.5 % Materials 8.9 % Utilities 7.9 % Health Care 7.9 % Real Estate 7.4 % Information Technology 7.2 % Consumer Staples 6.6 % Energy 5.2 % Communication Services 0.7 % Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % | |
| C000006788 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Mid Cap Value Fund | |
| Class Name | Class R3 | |
| Trading Symbol | MVCHX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Mid Cap Value Fund for the period of October 1, 2023 to September 30, 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 $ 0.99 % | |
| Expenses Paid, Amount | $ 114 | |
| Expense Ratio, Percent | 0.99% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class R3 shares of the MFS Mid Cap Value Fund (fund) provided a total return of 29.58%, at net asset value. This compares with a return of 35.19% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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 Midcap ® Security selection within the information technology, industrials, and materials sectors contributed to relative performance. Top detractors from performance relative to the Russell Midcap ® Security selection within both the consumer discretionary and utilities sectors held back 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 9/30/24 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 29.58 % 11.61 % 9.66 % Comparative Benchmark(s) Russell 3000 ® 35.19 % 15.26 % 12.83 % Russell Midcap ® 29.01 % 10.33 % 8.93 % + 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 | $ 17,864,161,011 | |
| Holdings Count | Holding | 145 | |
| Advisory Fees Paid, Amount | $ 96,789,918 | [7] |
| Investment Company Portfolio Turnover | 27% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 17,864,161,011 Total Management Fee ($)#: 96,789,918 Total Number of Holdings: 145 Portfolio Turnover Rate (%): 27 # 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 9/30/24) Portfolio structure Equities 98.3 % Money Market Funds 1.7 % Equity sectors Financials 18.7 % Industrials 18.3 % Consumer Discretionary 9.5 % Materials 8.9 % Utilities 7.9 % Health Care 7.9 % Real Estate 7.4 % Information Technology 7.2 % Consumer Staples 6.6 % Energy 5.2 % Communication Services 0.7 % Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % | |
| C000006777 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Mid Cap Value Fund | |
| Class Name | Class R4 | |
| Trading Symbol | MVCJX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Mid Cap Value Fund for the period of October 1, 2023 to September 30, 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 $ 0.74 % | |
| Expenses Paid, Amount | $ 85 | |
| Expense Ratio, Percent | 0.74% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class R4 shares of the MFS Mid Cap Value Fund (fund) provided a total return of 29.91%, at net asset value. This compares with a return of 35.19% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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 Midcap ® Security selection within the information technology, industrials, and materials sectors contributed to relative performance. Top detractors from performance relative to the Russell Midcap ® Security selection within both the consumer discretionary and utilities sectors held back 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 9/30/24 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 29.91 % 11.89 % 9.94 % Comparative Benchmark(s) Russell 3000 ® 35.19 % 15.26 % 12.83 % Russell Midcap ® 29.01 % 10.33 % 8.93 % + 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 | $ 17,864,161,011 | |
| Holdings Count | Holding | 145 | |
| Advisory Fees Paid, Amount | $ 96,789,918 | [8] |
| Investment Company Portfolio Turnover | 27% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 17,864,161,011 Total Management Fee ($)#: 96,789,918 Total Number of Holdings: 145 Portfolio Turnover Rate (%): 27 # 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 9/30/24) Portfolio structure Equities 98.3 % Money Market Funds 1.7 % Equity sectors Financials 18.7 % Industrials 18.3 % Consumer Discretionary 9.5 % Materials 8.9 % Utilities 7.9 % Health Care 7.9 % Real Estate 7.4 % Information Technology 7.2 % Consumer Staples 6.6 % Energy 5.2 % Communication Services 0.7 % Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % | |
| C000125404 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Mid Cap Value Fund | |
| Class Name | Class R6 | |
| Trading Symbol | MVCKX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Mid Cap Value Fund for the period of October 1, 2023 to September 30, 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 $ 0.62 % | |
| Expenses Paid, Amount | $ 71 | |
| Expense Ratio, Percent | 0.62% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class R6 shares of the MFS Mid Cap Value Fund (fund) provided a total return of 30.08%, at net asset value. This compares with a return of 35.19% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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 Midcap ® Security selection within the information technology, industrials, and materials sectors contributed to relative performance. Top detractors from performance relative to the Russell Midcap ® Security selection within both the consumer discretionary and utilities sectors held back 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 9/30/24 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 30.08 % 12.03 % 10.09 % Comparative Benchmark(s) Russell 3000 ® 35.19 % 15.26 % 12.83 % Russell Midcap ® 29.01 % 10.33 % 8.93 % + 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 | $ 17,864,161,011 | |
| Holdings Count | Holding | 145 | |
| Advisory Fees Paid, Amount | $ 96,789,918 | [9] |
| Investment Company Portfolio Turnover | 27% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 17,864,161,011 Total Management Fee ($)#: 96,789,918 Total Number of Holdings: 145 Portfolio Turnover Rate (%): 27 # 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 9/30/24) Portfolio structure Equities 98.3 % Money Market Funds 1.7 % Equity sectors Financials 18.7 % Industrials 18.3 % Consumer Discretionary 9.5 % Materials 8.9 % Utilities 7.9 % Health Care 7.9 % Real Estate 7.4 % Information Technology 7.2 % Consumer Staples 6.6 % Energy 5.2 % Communication Services 0.7 % Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings Hartford Financial Services Group, Inc. 1.4 % PG&E Corp. 1.4 % M&T Bank Corp. 1.1 % Toll Brothers, Inc. 1.1 % Cencora, Inc. 1.1 % Extra Space Storage, Inc., REIT 1.1 % Public Service Enterprise Group, Inc. 1.1 % Eastman Chemical Co. 1.1 % Graphic Packaging Holding Co. 1.1 % Leidos Holdings, Inc. 1.0 % | |
| C000006789 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Blended Research® Core Equity Fund | |
| Class Name | Class A | |
| Trading Symbol | MUEAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Blended Research Core Equity Fund for the period of October 1, 2023 to September 30, 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 $ 0.74 % | |
| Expenses Paid, Amount | $ 88 | |
| Expense Ratio, Percent | 0.74% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class A shares of the MFS Blended Research Core Equity Fund (fund) provided a total return of 36.61%, at net asset value. This compares with a return of 36.35% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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: Security selection within both the utilities and information technology sectors benefited relative performance. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Security selection within both the health care and industrials sectors held back 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 9/30/24 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 36.61 % 16.31 % 12.11 % A with initial sales charge (5.75%) 28.75 % 14.95 % 11.45 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 36.35 % 15.98 % 13.38 % ∆ 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 | $ 1,438,688,207 | |
| Holdings Count | Holding | 110 | |
| Advisory Fees Paid, Amount | $ 4,759,236 | [10] |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 1,438,688,207 Total Management Fee ($)#: 4,759,236 Total Number of Holdings: 110 Portfolio Turnover Rate (%): 44 # 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 9/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Information Technology 30.3 % Financials 13.2 % Health Care 12.2 % Communication Services 9.5 % Consumer Discretionary 9.4 % Industrials 7.5 % Consumer Staples 5.7 % Energy 3.8 % Real Estate 3.1 % Utilities 3.0 % Materials 1.4 % Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % | |
| C000006790 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Blended Research® Core Equity Fund | |
| Class Name | Class B | |
| Trading Symbol | MUSBX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Blended Research Core Equity Fund for the period of October 1, 2023 to September 30, 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 $ 1.49 % | |
| Expenses Paid, Amount | $ 176 | |
| Expense Ratio, Percent | 1.49% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class B shares of the MFS Blended Research Core Equity Fund (fund) provided a total return of 35.58%, at net asset value. This compares with a return of 36.35% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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: Security selection within both the utilities and information technology sectors benefited relative performance. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Security selection within both the health care and industrials sectors held back 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 9/30/24 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 35.58 % 15.44 % 11.27 % B with CDSC (declining over six years from 4% to 0%) × 31.58 % 15.21 % 11.27 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 36.35 % 15.98 % 13.38 % ∆ 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 | $ 1,438,688,207 | |
| Holdings Count | Holding | 110 | |
| Advisory Fees Paid, Amount | $ 4,759,236 | [11] |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 1,438,688,207 Total Management Fee ($)#: 4,759,236 Total Number of Holdings: 110 Portfolio Turnover Rate (%): 44 # 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 9/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Information Technology 30.3 % Financials 13.2 % Health Care 12.2 % Communication Services 9.5 % Consumer Discretionary 9.4 % Industrials 7.5 % Consumer Staples 5.7 % Energy 3.8 % Real Estate 3.1 % Utilities 3.0 % Materials 1.4 % Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % | |
| C000006791 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Blended Research® Core Equity Fund | |
| Class Name | Class C | |
| Trading Symbol | MUECX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Blended Research Core Equity Fund for the period of October 1, 2023 to September 30, 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 $ 1.49 % | |
| Expenses Paid, Amount | $ 175 | |
| Expense Ratio, Percent | 1.49% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class C shares of the MFS Blended Research Core Equity Fund (fund) provided a total return of 35.57%, at net asset value. This compares with a return of 36.35% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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: Security selection within both the utilities and information technology sectors benefited relative performance. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Security selection within both the health care and industrials sectors held back 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 9/30/24 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 35.57 % 15.45 % 11.27 % C with CDSC (1% for 12 months) × 34.57 % 15.45 % 11.27 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 36.35 % 15.98 % 13.38 % ∆ 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 | $ 1,438,688,207 | |
| Holdings Count | Holding | 110 | |
| Advisory Fees Paid, Amount | $ 4,759,236 | [12] |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 1,438,688,207 Total Management Fee ($)#: 4,759,236 Total Number of Holdings: 110 Portfolio Turnover Rate (%): 44 # 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 9/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Information Technology 30.3 % Financials 13.2 % Health Care 12.2 % Communication Services 9.5 % Consumer Discretionary 9.4 % Industrials 7.5 % Consumer Staples 5.7 % Energy 3.8 % Real Estate 3.1 % Utilities 3.0 % Materials 1.4 % Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % | |
| C000006792 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Blended Research® Core Equity Fund | |
| Class Name | Class I | |
| Trading Symbol | MUSEX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Blended Research Core Equity Fund for the period of October 1, 2023 to September 30, 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 $ 0.49 % | |
| Expenses Paid, Amount | $ 58 | |
| Expense Ratio, Percent | 0.49% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class I shares of the MFS Blended Research Core Equity Fund (fund) provided a total return of 36.95%, at net asset value. This compares with a return of 36.35% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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: Security selection within both the utilities and information technology sectors benefited relative performance. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Security selection within both the health care and industrials sectors held back 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 9/30/24 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 36.95 % 16.61 % 12.39 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 36.35 % 15.98 % 13.38 % ∆ 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 | $ 1,438,688,207 | |
| Holdings Count | Holding | 110 | |
| Advisory Fees Paid, Amount | $ 4,759,236 | [13] |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 1,438,688,207 Total Management Fee ($)#: 4,759,236 Total Number of Holdings: 110 Portfolio Turnover Rate (%): 44 # 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 9/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Information Technology 30.3 % Financials 13.2 % Health Care 12.2 % Communication Services 9.5 % Consumer Discretionary 9.4 % Industrials 7.5 % Consumer Staples 5.7 % Energy 3.8 % Real Estate 3.1 % Utilities 3.0 % Materials 1.4 % Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % | |
| C000068492 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Blended Research® Core Equity Fund | |
| Class Name | Class R1 | |
| Trading Symbol | MUERX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Blended Research Core Equity Fund for the period of October 1, 2023 to September 30, 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 $ 1.49 % | |
| Expenses Paid, Amount | $ 176 | |
| Expense Ratio, Percent | 1.49% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class R1 shares of the MFS Blended Research Core Equity Fund (fund) provided a total return of 35.59%, at net asset value. This compares with a return of 36.35% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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: Security selection within both the utilities and information technology sectors benefited relative performance. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Security selection within both the health care and industrials sectors held back 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 9/30/24 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 35.59 % 15.40 % 11.25 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 36.35 % 15.98 % 13.38 % ∆ 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 | $ 1,438,688,207 | |
| Holdings Count | Holding | 110 | |
| Advisory Fees Paid, Amount | $ 4,759,236 | [14] |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 1,438,688,207 Total Management Fee ($)#: 4,759,236 Total Number of Holdings: 110 Portfolio Turnover Rate (%): 44 # 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 9/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Information Technology 30.3 % Financials 13.2 % Health Care 12.2 % Communication Services 9.5 % Consumer Discretionary 9.4 % Industrials 7.5 % Consumer Staples 5.7 % Energy 3.8 % Real Estate 3.1 % Utilities 3.0 % Materials 1.4 % Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % | |
| C000068493 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Blended Research® Core Equity Fund | |
| Class Name | Class R2 | |
| Trading Symbol | MUESX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Blended Research Core Equity Fund for the period of October 1, 2023 to September 30, 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 $ 0.99 % | |
| Expenses Paid, Amount | $ 117 | |
| Expense Ratio, Percent | 0.99% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class R2 shares of the MFS Blended Research Core Equity Fund (fund) provided a total return of 36.25%, at net asset value. This compares with a return of 36.35% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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: Security selection within both the utilities and information technology sectors benefited relative performance. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Security selection within both the health care and industrials sectors held back 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 9/30/24 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 36.25 % 16.02 % 11.83 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 36.35 % 15.98 % 13.38 % ∆ 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 | $ 1,438,688,207 | |
| Holdings Count | Holding | 110 | |
| Advisory Fees Paid, Amount | $ 4,759,236 | [15] |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 1,438,688,207 Total Management Fee ($)#: 4,759,236 Total Number of Holdings: 110 Portfolio Turnover Rate (%): 44 # 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 9/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Information Technology 30.3 % Financials 13.2 % Health Care 12.2 % Communication Services 9.5 % Consumer Discretionary 9.4 % Industrials 7.5 % Consumer Staples 5.7 % Energy 3.8 % Real Estate 3.1 % Utilities 3.0 % Materials 1.4 % Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % | |
| C000068494 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Blended Research® Core Equity Fund | |
| Class Name | Class R3 | |
| Trading Symbol | MUETX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Blended Research Core Equity Fund for the period of October 1, 2023 to September 30, 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 $ 0.74 % | |
| Expenses Paid, Amount | $ 88 | |
| Expense Ratio, Percent | 0.74% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class R3 shares of the MFS Blended Research Core Equity Fund (fund) provided a total return of 36.57%, at net asset value. This compares with a return of 36.35% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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: Security selection within both the utilities and information technology sectors benefited relative performance. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Security selection within both the health care and industrials sectors held back 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 9/30/24 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 36.57 % 16.31 % 12.10 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 36.35 % 15.98 % 13.38 % ∆ 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 | $ 1,438,688,207 | |
| Holdings Count | Holding | 110 | |
| Advisory Fees Paid, Amount | $ 4,759,236 | [16] |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 1,438,688,207 Total Management Fee ($)#: 4,759,236 Total Number of Holdings: 110 Portfolio Turnover Rate (%): 44 # 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 9/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Information Technology 30.3 % Financials 13.2 % Health Care 12.2 % Communication Services 9.5 % Consumer Discretionary 9.4 % Industrials 7.5 % Consumer Staples 5.7 % Energy 3.8 % Real Estate 3.1 % Utilities 3.0 % Materials 1.4 % Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % | |
| C000068495 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Blended Research® Core Equity Fund | |
| Class Name | Class R4 | |
| Trading Symbol | MUEUX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Blended Research Core Equity Fund for the period of October 1, 2023 to September 30, 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 $ 0.49 % | |
| Expenses Paid, Amount | $ 58 | |
| Expense Ratio, Percent | 0.49% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class R4 shares of the MFS Blended Research Core Equity Fund (fund) provided a total return of 36.96%, at net asset value. This compares with a return of 36.35% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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: Security selection within both the utilities and information technology sectors benefited relative performance. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Security selection within both the health care and industrials sectors held back 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 9/30/24 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 36.96 % 16.61 % 12.39 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 36.35 % 15.98 % 13.38 % ∆ 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 | $ 1,438,688,207 | |
| Holdings Count | Holding | 110 | |
| Advisory Fees Paid, Amount | $ 4,759,236 | [17] |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 1,438,688,207 Total Management Fee ($)#: 4,759,236 Total Number of Holdings: 110 Portfolio Turnover Rate (%): 44 # 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 9/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Information Technology 30.3 % Financials 13.2 % Health Care 12.2 % Communication Services 9.5 % Consumer Discretionary 9.4 % Industrials 7.5 % Consumer Staples 5.7 % Energy 3.8 % Real Estate 3.1 % Utilities 3.0 % Materials 1.4 % Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % | |
| C000068496 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | MFS® Blended Research® Core Equity Fund | |
| Class Name | Class R6 | |
| Trading Symbol | MUEVX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about MFS Blended Research Core Equity Fund for the period of October 1, 2023 to September 30, 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 $ 0.39 % | |
| Expenses Paid, Amount | $ 46 | |
| Expense Ratio, Percent | 0.39% | |
| Factors Affecting Performance [Text Block] | MANAGEMENT'S DISCUSSION OF FUND PERFORMANCE For the twelve months ended September 30, 2024, Class R6 shares of the MFS Blended Research Core Equity Fund (fund) provided a total return of 37.05%, at net asset value. This compares with a return of 36.35% 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. At the end of the period, China unveiled a sizable stimulus package aimed at shoring up its property sector and bolstering consumer and investor confidence. 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: Security selection within both the utilities and information technology sectors benefited relative performance. Top detractors from performance relative to the Standard & Poor’s 500 Stock Index: Security selection within both the health care and industrials sectors held back 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 9/30/24 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 37.05 % 16.72 % 12.51 % Comparative Benchmark(s) Standard & Poor's 500 Stock Index ∆ 36.35 % 15.98 % 13.38 % ∆ 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 | $ 1,438,688,207 | |
| Holdings Count | Holding | 110 | |
| Advisory Fees Paid, Amount | $ 4,759,236 | [18] |
| Investment Company Portfolio Turnover | 44% | |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 9/30/24 Net Assets ($): 1,438,688,207 Total Management Fee ($)#: 4,759,236 Total Number of Holdings: 110 Portfolio Turnover Rate (%): 44 # 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 9/30/24) Portfolio structure Equities 99.1 % Money Market Funds 0.9 % Equity sectors Information Technology 30.3 % Financials 13.2 % Health Care 12.2 % Communication Services 9.5 % Consumer Discretionary 9.4 % Industrials 7.5 % Consumer Staples 5.7 % Energy 3.8 % Real Estate 3.1 % Utilities 3.0 % Materials 1.4 % Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % MFS uses the Global Industry Classification Standard (GICS ® | |
| Largest Holdings [Text Block] | Top ten holdings NVIDIA Corp. 7.5 % Microsoft Corp. 7.0 % Apple, Inc. 6.6 % Amazon.com, Inc. 4.1 % Meta Platforms, Inc., "A" 4.0 % Alphabet, Inc., "A" 2.4 % AbbVie, Inc. 2.1 % Visa, Inc., "A" 2.0 % Johnson & Johnson 1.9 % Salesforce, Inc. 1.8 % | |
| [1]Includes the effect of any management fee waivers, if applicable.[2]Includes the effect of any management fee waivers, if applicable.[3]Includes the effect of any management fee waivers, if applicable.[4]Includes the effect of any management fee waivers, if applicable.[5]Includes the effect of any management fee waivers, if applicable.[6]Includes the effect of any management fee waivers, if applicable.[7]Includes the effect of any management fee waivers, if applicable.[8]Includes the effect of any management fee waivers, if applicable.[9]Includes the effect of any management fee waivers, if applicable.[10]Includes the effect of any management fee waivers, if applicable.[11]Includes the effect of any management fee waivers, if applicable.[12]Includes the effect of any management fee waivers, if applicable.[13]Includes the effect of any management fee waivers, if applicable.[14]Includes the effect of any management fee waivers, if applicable.[15]Includes the effect of any management fee waivers, if applicable.[16]Includes the effect of any management fee waivers, if applicable.[17]Includes the effect of any management fee waivers, if applicable.[18]Includes the effect of any management fee waivers, if applicable. | ||
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 60 Months Ended | 120 Months Ended | |||||||||||
| Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | ||
| C000006776 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A with initial sales charge (5.75%) | |||||||||||||
| Average Annual Return, Percent | 22.15% | 10.30% | 9.01% | |||||||||||
| C000006776 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A without sales charge | |||||||||||||
| Account Value | $ 23,703 | $ 23,703 | $ 23,703 | $ 18,289 | $ 16,157 | $ 18,041 | $ 12,746 | $ 13,686 | $ 13,162 | $ 12,145 | $ 10,699 | $ 9,438 | $ 9,425 | |
| Average Annual Return, Percent | 29.60% | 11.61% | 9.66% | |||||||||||
| C000006781 [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] | 24.63% | 10.51% | 8.84% | ||||||||||
| C000006781 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B without sales charge | |||||||||||||
| Account Value | $ 23,334 | $ 23,334 | $ 23,334 | 18,140 | 16,141 | 18,168 | 12,929 | 13,985 | 13,554 | 12,598 | 11,179 | 9,939 | 10,000 | |
| Average Annual Return, Percent | 28.63% | 10.78% | 8.84% | |||||||||||
| C000006782 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C with CDSC (1% for 12 months) | |||||||||||||
| Average Annual Return, Percent | [2] | 27.61% | 10.77% | 8.84% | ||||||||||
| C000006782 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C without sales charge | |||||||||||||
| Account Value | $ 23,322 | $ 23,322 | $ 23,322 | 18,133 | 16,142 | 18,162 | 12,922 | 13,982 | 13,546 | 12,598 | 11,176 | 9,939 | 10,000 | |
| Average Annual Return, Percent | 28.61% | 10.77% | 8.84% | |||||||||||
| C000006783 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | I without sales charge | |||||||||||||
| Account Value | $ 25,782 | $ 25,782 | $ 25,782 | 19,847 | 17,485 | 19,477 | 13,726 | 14,703 | 14,105 | 12,981 | 11,407 | 10,036 | 10,000 | |
| Average Annual Return, Percent | 29.91% | 11.89% | 9.93% | |||||||||||
| C000006785 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R1 without sales charge | |||||||||||||
| Account Value | $ 23,332 | $ 23,332 | $ 23,332 | 18,137 | 16,144 | 18,162 | 12,924 | 13,988 | 13,554 | 12,596 | 11,183 | 9,938 | 10,000 | |
| Average Annual Return, Percent | 28.64% | 10.77% | 8.84% | |||||||||||
| C000006787 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R2 without sales charge | |||||||||||||
| Account Value | $ 24,525 | $ 24,525 | $ 24,525 | 18,973 | 16,804 | 18,813 | 13,320 | 14,335 | 13,824 | 12,788 | 11,293 | 9,988 | 10,000 | |
| Average Annual Return, Percent | 29.26% | 11.34% | 9.39% | |||||||||||
| C000006788 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R3 without sales charge | |||||||||||||
| Account Value | $ 25,147 | $ 25,147 | $ 25,147 | 19,406 | 17,142 | 19,144 | 13,525 | 14,519 | 13,967 | 12,888 | 11,353 | 10,013 | 10,000 | |
| Average Annual Return, Percent | 29.58% | 11.61% | 9.66% | |||||||||||
| C000006777 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R4 without sales charge | |||||||||||||
| Account Value | $ 25,788 | $ 25,788 | $ 25,788 | 19,850 | 17,488 | 19,487 | 13,731 | 14,707 | 14,110 | 12,983 | 11,408 | 10,043 | 10,000 | |
| Average Annual Return, Percent | 29.91% | 11.89% | 9.94% | |||||||||||
| C000125404 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R6 without sales charge | |||||||||||||
| Account Value | $ 26,144 | $ 26,144 | $ 26,144 | 20,098 | 17,690 | 19,686 | 13,850 | 14,815 | 14,192 | 13,043 | 11,447 | 10,059 | 10,000 | |
| Average Annual Return, Percent | 30.08% | 12.03% | 10.09% | |||||||||||
| C000006789 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A with initial sales charge (5.75%) | |||||||||||||
| Average Annual Return, Percent | 28.75% | 14.95% | 11.45% | |||||||||||
| C000006789 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | A without sales charge | |||||||||||||
| Account Value | $ 29,556 | $ 29,556 | $ 29,556 | 21,635 | 17,709 | 20,481 | 15,671 | 13,883 | 13,970 | 12,072 | 10,414 | 9,304 | 9,425 | |
| Average Annual Return, Percent | 36.61% | 16.31% | 12.11% | |||||||||||
| C000006790 [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] | 31.58% | 15.21% | 11.27% | ||||||||||
| C000006790 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | B without sales charge | |||||||||||||
| Account Value | $ 29,084 | $ 29,084 | $ 29,084 | 21,452 | 17,687 | 20,614 | 15,894 | 14,188 | 14,383 | 12,520 | 10,882 | 9,796 | 10,000 | |
| Average Annual Return, Percent | 35.58% | 15.44% | 11.27% | |||||||||||
| C000006791 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C with CDSC (1% for 12 months) | |||||||||||||
| Average Annual Return, Percent | [4] | 34.57% | 15.45% | 11.27% | ||||||||||
| C000006791 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | C without sales charge | |||||||||||||
| Account Value | $ 29,080 | $ 29,080 | $ 29,080 | 21,450 | 17,687 | 20,614 | 15,886 | 14,181 | 14,379 | 12,518 | 10,882 | 9,795 | 10,000 | |
| Average Annual Return, Percent | 35.57% | 15.45% | 11.27% | |||||||||||
| C000006792 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | I without sales charge | |||||||||||||
| Account Value | $ 32,144 | $ 32,144 | $ 32,144 | 23,471 | 19,163 | 22,106 | 16,870 | 14,910 | 14,967 | 12,903 | 11,106 | 9,894 | 10,000 | |
| Average Annual Return, Percent | 36.95% | 16.61% | 12.39% | |||||||||||
| C000068492 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R1 without sales charge | |||||||||||||
| Account Value | $ 29,044 | $ 29,044 | $ 29,044 | 21,421 | 17,662 | 20,587 | 15,865 | 14,192 | 14,389 | 12,525 | 10,888 | 9,798 | 10,000 | |
| Average Annual Return, Percent | 35.59% | 15.40% | 11.25% | |||||||||||
| C000068493 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R2 without sales charge | |||||||||||||
| Account Value | $ 30,578 | $ 30,578 | $ 30,578 | 22,442 | 18,412 | 21,344 | 16,377 | 14,544 | 14,671 | 12,706 | 10,995 | 9,847 | 10,000 | |
| Average Annual Return, Percent | 36.25% | 16.02% | 11.83% | |||||||||||
| C000068494 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R3 without sales charge | |||||||||||||
| Account Value | $ 31,346 | $ 31,346 | $ 31,346 | 22,953 | 18,783 | 21,722 | 16,619 | 14,727 | 14,816 | 12,802 | 11,047 | 9,867 | 10,000 | |
| Average Annual Return, Percent | 36.57% | 16.31% | 12.10% | |||||||||||
| C000068495 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R4 without sales charge | |||||||||||||
| Account Value | $ 32,150 | $ 32,150 | $ 32,150 | 23,475 | 19,165 | 22,112 | 16,872 | 14,911 | 14,970 | 12,903 | 11,104 | 9,897 | 10,000 | |
| Average Annual Return, Percent | 36.96% | 16.61% | 12.39% | |||||||||||
| C000068496 [Member] | Without Sales Load [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | R6 without sales charge | |||||||||||||
| Account Value | $ 32,502 | $ 32,502 | $ 32,502 | 23,715 | 19,337 | 22,284 | 16,994 | 15,001 | 15,043 | 12,950 | 11,134 | 9,907 | 10,000 | |
| Average Annual Return, Percent | 37.05% | 16.72% | 12.51% | |||||||||||
| Russell 3000 Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Russell 3000® Index | |||||||||||||
| Account Value | $ 33,432 | $ 33,432 | $ 33,432 | 24,729 | 20,528 | 24,921 | 18,898 | 16,433 | 15,967 | 13,579 | 11,440 | 9,951 | 10,000 | |
| Average Annual Return, Percent | [5],[6] | 35.19% | 15.26% | 12.83% | ||||||||||
| Standard And Poors 500 Stock Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Standard & Poor's 500 Stock Index | |||||||||||||
| Account Value | $ 35,098 | $ 35,098 | $ 35,098 | 25,741 | 21,165 | 25,040 | 19,260 | 16,727 | 16,044 | 13,607 | 11,472 | 9,939 | 10,000 | |
| Average Annual Return, Percent | [7] | 36.35% | 15.98% | 13.38% | ||||||||||
| Russell Midcap Value Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Russell Midcap® Value Index | |||||||||||||
| Account Value | $ 23,528 | $ 23,528 | $ 23,528 | $ 18,237 | $ 16,423 | $ 18,998 | $ 13,342 | $ 14,392 | $ 14,165 | $ 13,019 | $ 11,484 | $ 9,793 | $ 10,000 | |
| Average Annual Return, Percent | [5],[6] | 29.01% | 10.33% | 8.93% | ||||||||||
| [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]Effective May 1, 2024, the Russell 3000 ® ® ® | ||||||||||||||
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| C000006776 [Member] | Hartford Financial Services Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006776 [Member] | M And T Bank Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006776 [Member] | Toll Brothers Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006776 [Member] | Cencora Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006776 [Member] | Extra Space Storage Inc REIT [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006776 [Member] | Public Service Enterprise Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006776 [Member] | Eastman Chemical Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006776 [Member] | Graphic Packaging Holding Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006776 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000006776 [Member] | PG And E Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006776 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000006776 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.70% |
| C000006776 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000006776 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006776 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000006776 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006776 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006776 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006776 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000006776 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000006776 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000006776 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.30% |
| C000006776 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000006781 [Member] | Hartford Financial Services Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006781 [Member] | M And T Bank Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006781 [Member] | Toll Brothers Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006781 [Member] | Cencora Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006781 [Member] | Extra Space Storage Inc REIT [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006781 [Member] | Public Service Enterprise Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006781 [Member] | Eastman Chemical Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006781 [Member] | Graphic Packaging Holding Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006781 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000006781 [Member] | PG And E Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006781 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000006781 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.70% |
| C000006781 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000006781 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006781 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000006781 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006781 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006781 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006781 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000006781 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000006781 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000006781 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.30% |
| C000006781 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000006782 [Member] | Hartford Financial Services Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006782 [Member] | M And T Bank Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006782 [Member] | Toll Brothers Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006782 [Member] | Cencora Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006782 [Member] | Extra Space Storage Inc REIT [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006782 [Member] | Public Service Enterprise Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006782 [Member] | Eastman Chemical Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006782 [Member] | Graphic Packaging Holding Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006782 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000006782 [Member] | PG And E Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006782 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000006782 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.70% |
| C000006782 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000006782 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006782 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000006782 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006782 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006782 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006782 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000006782 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000006782 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000006782 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.30% |
| C000006782 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000006783 [Member] | Hartford Financial Services Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006783 [Member] | M And T Bank Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006783 [Member] | Toll Brothers Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006783 [Member] | Cencora Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006783 [Member] | Extra Space Storage Inc REIT [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006783 [Member] | Public Service Enterprise Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006783 [Member] | Eastman Chemical Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006783 [Member] | Graphic Packaging Holding Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006783 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000006783 [Member] | PG And E Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006783 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000006783 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.70% |
| C000006783 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000006783 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006783 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000006783 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006783 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006783 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006783 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000006783 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000006783 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000006783 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.30% |
| C000006783 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000006785 [Member] | Hartford Financial Services Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006785 [Member] | M And T Bank Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006785 [Member] | Toll Brothers Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006785 [Member] | Cencora Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006785 [Member] | Extra Space Storage Inc REIT [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006785 [Member] | Public Service Enterprise Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006785 [Member] | Eastman Chemical Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006785 [Member] | Graphic Packaging Holding Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006785 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000006785 [Member] | PG And E Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006785 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000006785 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.70% |
| C000006785 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000006785 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006785 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000006785 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006785 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006785 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006785 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000006785 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000006785 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000006785 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.30% |
| C000006785 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000006787 [Member] | Hartford Financial Services Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006787 [Member] | M And T Bank Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006787 [Member] | Toll Brothers Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006787 [Member] | Cencora Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006787 [Member] | Extra Space Storage Inc REIT [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006787 [Member] | Public Service Enterprise Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006787 [Member] | Eastman Chemical Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006787 [Member] | Graphic Packaging Holding Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006787 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000006787 [Member] | PG And E Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006787 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000006787 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.70% |
| C000006787 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000006787 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006787 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000006787 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006787 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006787 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006787 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000006787 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000006787 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000006787 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.30% |
| C000006787 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000006788 [Member] | Hartford Financial Services Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006788 [Member] | M And T Bank Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006788 [Member] | Toll Brothers Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006788 [Member] | Cencora Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006788 [Member] | Extra Space Storage Inc REIT [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006788 [Member] | Public Service Enterprise Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006788 [Member] | Eastman Chemical Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006788 [Member] | Graphic Packaging Holding Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006788 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000006788 [Member] | PG And E Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006788 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000006788 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.70% |
| C000006788 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000006788 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006788 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000006788 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006788 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006788 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006788 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000006788 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000006788 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000006788 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.30% |
| C000006788 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000006777 [Member] | Hartford Financial Services Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006777 [Member] | M And T Bank Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006777 [Member] | Toll Brothers Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006777 [Member] | Cencora Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006777 [Member] | Extra Space Storage Inc REIT [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006777 [Member] | Public Service Enterprise Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006777 [Member] | Eastman Chemical Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006777 [Member] | Graphic Packaging Holding Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000006777 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000006777 [Member] | PG And E Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006777 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000006777 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.70% |
| C000006777 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000006777 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006777 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000006777 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006777 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000006777 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006777 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000006777 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000006777 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000006777 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.30% |
| C000006777 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000125404 [Member] | Hartford Financial Services Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000125404 [Member] | M And T Bank Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000125404 [Member] | Toll Brothers Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000125404 [Member] | Cencora Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000125404 [Member] | Extra Space Storage Inc REIT [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000125404 [Member] | Public Service Enterprise Group Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000125404 [Member] | Eastman Chemical Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000125404 [Member] | Graphic Packaging Holding Co [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000125404 [Member] | Leidos Holdings Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000125404 [Member] | PG And E Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000125404 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.20% |
| C000125404 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.70% |
| C000125404 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.40% |
| C000125404 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000125404 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000125404 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000125404 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000125404 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000125404 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000125404 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000125404 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.90% |
| C000125404 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.30% |
| C000125404 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| C000006789 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000006789 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000006789 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000006789 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000006789 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000006789 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006789 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000006789 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000006789 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000006789 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000006789 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000006789 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000006789 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000006789 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000006789 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006789 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000006789 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000006789 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000006789 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000006789 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.30% |
| C000006789 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006789 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.10% |
| C000006789 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000006790 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000006790 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000006790 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000006790 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000006790 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000006790 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006790 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000006790 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000006790 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000006790 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000006790 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000006790 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000006790 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000006790 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000006790 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006790 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000006790 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000006790 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000006790 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000006790 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.30% |
| C000006790 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006790 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.10% |
| C000006790 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000006791 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000006791 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000006791 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000006791 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000006791 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000006791 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006791 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000006791 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000006791 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000006791 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000006791 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000006791 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000006791 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000006791 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000006791 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006791 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000006791 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000006791 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000006791 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000006791 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.30% |
| C000006791 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006791 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.10% |
| C000006791 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000006792 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000006792 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000006792 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000006792 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000006792 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000006792 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000006792 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000006792 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000006792 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000006792 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000006792 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000006792 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000006792 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000006792 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000006792 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000006792 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000006792 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000006792 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000006792 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000006792 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.30% |
| C000006792 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000006792 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.10% |
| C000006792 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000068492 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000068492 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000068492 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000068492 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000068492 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000068492 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000068492 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000068492 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000068492 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000068492 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000068492 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000068492 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000068492 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000068492 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000068492 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000068492 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000068492 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000068492 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000068492 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000068492 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.30% |
| C000068492 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000068492 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.10% |
| C000068492 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000068493 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000068493 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000068493 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000068493 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000068493 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000068493 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000068493 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000068493 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000068493 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000068493 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000068493 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000068493 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000068493 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000068493 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000068493 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000068493 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000068493 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000068493 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000068493 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000068493 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.30% |
| C000068493 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000068493 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.10% |
| C000068493 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000068494 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000068494 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000068494 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000068494 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000068494 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000068494 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000068494 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000068494 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000068494 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000068494 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000068494 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000068494 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000068494 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000068494 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000068494 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000068494 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000068494 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000068494 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000068494 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000068494 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.30% |
| C000068494 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000068494 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.10% |
| C000068494 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000068495 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000068495 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000068495 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000068495 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000068495 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000068495 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000068495 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000068495 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000068495 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000068495 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000068495 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000068495 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000068495 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000068495 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000068495 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000068495 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000068495 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000068495 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000068495 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000068495 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.30% |
| C000068495 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000068495 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.10% |
| C000068495 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000068496 [Member] | Johnson And Johnson [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000068496 [Member] | Salesforce Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000068496 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000068496 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000068496 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| C000068496 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000068496 [Member] | Amazon com Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000068496 [Member] | Meta Platforms Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000068496 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000068496 [Member] | AbbVie Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000068496 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000068496 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000068496 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.10% |
| C000068496 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000068496 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000068496 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000068496 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000068496 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000068496 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.50% |
| C000068496 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.30% |
| C000068496 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.40% |
| C000068496 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 99.10% |
| C000068496 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
