MFS Massachusetts Investors Growth Stock Fund (MIGHX)
Company Profile
| Form N-CSR Cover | 6 Months Ended |
| May 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | MASSACHUSETTS INVESTORS GROWTH STOCK FUND |
| Entity Central Index Key | 0000063090 |
| Document Period End Date | May 31, 2024 |
| Shareholder Report | 6 Months Ended |
| May 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | MASSACHUSETTS INVESTORS GROWTH STOCK FUND |
| Entity Central Index Key | 0000063090 |
| Document Period End Date | May 31, 2024 |
| C000002031 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Massachusetts Investors Growth Stock Fund |
| Class Name | Class I |
| Trading Symbol | MGTIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Massachusetts Investors Growth Stock Fund for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $ 0.45 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 12,564,901,311 |
| Holdings Count | Holding | 58 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 5/31/24 Net Assets ($): 12,564,901,311 Portfolio Turnover (%): 11 Total Number of Holdings: 58 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 5/31/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % GICS equity sectors Information Technology 37.1 % Financials 13.8 % Health Care 12.0 % Communication Services 9.3 % Consumer Discretionary 8.6 % Industrials 8.2 % Consumer Staples 6.4 % Real Estate 1.6 % Materials 1.1 % Utilities 0.6 % Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % MFS uses the Global Industry Classification Standard (GICS ® |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % |
| C000002036 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Massachusetts Investors Growth Stock Fund |
| Class Name | Class R2 |
| Trading Symbol | MIRGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Massachusetts Investors Growth Stock Fund for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $ 0.95 % |
| Expenses Paid, Amount | $ 50 |
| Expense Ratio, Percent | 0.95% |
| Net Assets | $ 12,564,901,311 |
| Holdings Count | Holding | 58 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 5/31/24 Net Assets ($): 12,564,901,311 Portfolio Turnover (%): 11 Total Number of Holdings: 58 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 5/31/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % GICS equity sectors Information Technology 37.1 % Financials 13.8 % Health Care 12.0 % Communication Services 9.3 % Consumer Discretionary 8.6 % Industrials 8.2 % Consumer Staples 6.4 % Real Estate 1.6 % Materials 1.1 % Utilities 0.6 % Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % MFS uses the Global Industry Classification Standard (GICS ® |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % |
| C000002024 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Massachusetts Investors Growth Stock Fund |
| Class Name | Class R3 |
| Trading Symbol | MIGHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Massachusetts Investors Growth Stock Fund for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $ 0.70 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.70% |
| Net Assets | $ 12,564,901,311 |
| Holdings Count | Holding | 58 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 5/31/24 Net Assets ($): 12,564,901,311 Portfolio Turnover (%): 11 Total Number of Holdings: 58 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 5/31/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % GICS equity sectors Information Technology 37.1 % Financials 13.8 % Health Care 12.0 % Communication Services 9.3 % Consumer Discretionary 8.6 % Industrials 8.2 % Consumer Staples 6.4 % Real Estate 1.6 % Materials 1.1 % Utilities 0.6 % Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % MFS uses the Global Industry Classification Standard (GICS ® |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % |
| C000112291 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Massachusetts Investors Growth Stock Fund |
| Class Name | Class R |
| Trading Symbol | MIGNX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Massachusetts Investors Growth Stock Fund for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $ 0.36 % |
| Expenses Paid, Amount | $ 19 |
| Expense Ratio, Percent | 0.36% |
| Net Assets | $ 12,564,901,311 |
| Holdings Count | Holding | 58 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 5/31/24 Net Assets ($): 12,564,901,311 Portfolio Turnover (%): 11 Total Number of Holdings: 58 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 5/31/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % GICS equity sectors Information Technology 37.1 % Financials 13.8 % Health Care 12.0 % Communication Services 9.3 % Consumer Discretionary 8.6 % Industrials 8.2 % Consumer Staples 6.4 % Real Estate 1.6 % Materials 1.1 % Utilities 0.6 % Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % MFS uses the Global Industry Classification Standard (GICS ® |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % |
| C000002023 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Massachusetts InvestorsGrowth Stock Fund |
| Class Name | Class A |
| Trading Symbol | MIGFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Massachusetts Investors Growth Stock Fund for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $ 0.70 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.70% |
| Net Assets | $ 12,564,901,311 |
| Holdings Count | Holding | 58 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 5/31/24 Net Assets ($): 12,564,901,311 Portfolio Turnover (%): 11 Total Number of Holdings: 58 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 5/31/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % GICS equity sectors Information Technology 37.1 % Financials 13.8 % Health Care 12.0 % Communication Services 9.3 % Consumer Discretionary 8.6 % Industrials 8.2 % Consumer Staples 6.4 % Real Estate 1.6 % Materials 1.1 % Utilities 0.6 % Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % MFS uses the Global Industry Classification Standard (GICS ® |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % |
| C000002029 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Massachusetts Investors Growth Stock Fund |
| Class Name | Class B |
| Trading Symbol | MIGBX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Massachusetts Investors Growth Stock Fund for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $ 1.45 % |
| Expenses Paid, Amount | $ 77 |
| Expense Ratio, Percent | 1.45% |
| Net Assets | $ 12,564,901,311 |
| Holdings Count | Holding | 58 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 5/31/24 Net Assets ($): 12,564,901,311 Portfolio Turnover (%): 11 Total Number of Holdings: 58 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 5/31/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % GICS equity sectors Information Technology 37.1 % Financials 13.8 % Health Care 12.0 % Communication Services 9.3 % Consumer Discretionary 8.6 % Industrials 8.2 % Consumer Staples 6.4 % Real Estate 1.6 % Materials 1.1 % Utilities 0.6 % Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % MFS uses the Global Industry Classification Standard (GICS ® |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % |
| C000002025 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Massachusetts Investors Growth Stock Fund |
| Class Name | Class R4 |
| Trading Symbol | MIGKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Massachusetts Investors Growth Stock Fund for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $ 0.45 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 12,564,901,311 |
| Holdings Count | Holding | 58 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 5/31/24 Net Assets ($): 12,564,901,311 Portfolio Turnover (%): 11 Total Number of Holdings: 58 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 5/31/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % GICS equity sectors Information Technology 37.1 % Financials 13.8 % Health Care 12.0 % Communication Services 9.3 % Consumer Discretionary 8.6 % Industrials 8.2 % Consumer Staples 6.4 % Real Estate 1.6 % Materials 1.1 % Utilities 0.6 % Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % MFS uses the Global Industry Classification Standard (GICS ® |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % |
| C000002034 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Massachusetts Investors Growth Stock Fund |
| Class Name | Class R1 |
| Trading Symbol | MIGMX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Massachusetts Investors Growth Stock Fund for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $ 1.45 % |
| Expenses Paid, Amount | $ 77 |
| Expense Ratio, Percent | 1.45% |
| Net Assets | $ 12,564,901,311 |
| Holdings Count | Holding | 58 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 5/31/24 Net Assets ($): 12,564,901,311 Portfolio Turnover (%): 11 Total Number of Holdings: 58 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 5/31/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % GICS equity sectors Information Technology 37.1 % Financials 13.8 % Health Care 12.0 % Communication Services 9.3 % Consumer Discretionary 8.6 % Industrials 8.2 % Consumer Staples 6.4 % Real Estate 1.6 % Materials 1.1 % Utilities 0.6 % Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % MFS uses the Global Industry Classification Standard (GICS ® |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % |
| C000002030 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Massachusetts Investors Growth Stock Fund |
| Class Name | Class C |
| Trading Symbol | MIGDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Massachusetts Investors Growth Stock Fund for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-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 six months? (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 $ 1.45 % |
| Expenses Paid, Amount | $ 77 |
| Expense Ratio, Percent | 1.45% |
| Net Assets | $ 12,564,901,311 |
| Holdings Count | Holding | 58 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | FUND STATISTICS AS OF 5/31/24 Net Assets ($): 12,564,901,311 Portfolio Turnover (%): 11 Total Number of Holdings: 58 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 5/31/24) Portfolio structure Equities 98.7 % Money Market Funds 1.3 % GICS equity sectors Information Technology 37.1 % Financials 13.8 % Health Care 12.0 % Communication Services 9.3 % Consumer Discretionary 8.6 % Industrials 8.2 % Consumer Staples 6.4 % Real Estate 1.6 % Materials 1.1 % Utilities 0.6 % Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % MFS uses the Global Industry Classification Standard (GICS ® |
| Largest Holdings [Text Block] | Top ten holdings Microsoft Corp. 13.8 % Alphabet, Inc., "A" 5.9 % Apple, Inc. 5.3 % NVIDIA Corp. 4.8 % Visa, Inc., "A" 4.4 % Accenture PLC, "A" 2.7 % Church & Dwight Co., Inc. 2.4 % Aon PLC 2.1 % Agilent Technologies, Inc. 2.1 % Taiwan Semiconductor Manufacturing Co. Ltd., ADR 2.0 % |
| Shareholder Report, Holdings (Details) | May 31, 2024 |
| C000002031 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002031 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000002031 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002031 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000002031 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000002031 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000002031 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002031 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002031 [Member] | Church And Dwight Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002031 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002031 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002031 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000002031 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000002031 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002031 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002031 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000002031 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002031 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000002031 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000002031 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.10% |
| C000002031 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000002031 [Member] | Equities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.70% |
| C000002036 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002036 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000002036 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002036 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000002036 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000002036 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000002036 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002036 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002036 [Member] | Church And Dwight Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002036 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002036 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002036 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000002036 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000002036 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002036 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002036 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000002036 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002036 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000002036 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000002036 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.10% |
| C000002036 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000002036 [Member] | Equities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.70% |
| C000002024 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002024 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000002024 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002024 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000002024 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000002024 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000002024 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002024 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002024 [Member] | Church And Dwight Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002024 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002024 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002024 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000002024 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000002024 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002024 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002024 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000002024 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002024 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000002024 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000002024 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.10% |
| C000002024 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000002024 [Member] | Equities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.70% |
| C000112291 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000112291 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000112291 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000112291 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000112291 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000112291 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000112291 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000112291 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000112291 [Member] | Church And Dwight Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000112291 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000112291 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000112291 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000112291 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000112291 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000112291 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000112291 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000112291 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000112291 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000112291 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000112291 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.10% |
| C000112291 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000112291 [Member] | Equities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.70% |
| C000002023 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002023 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000002023 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002023 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000002023 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000002023 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000002023 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002023 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002023 [Member] | Church And Dwight Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002023 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002023 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002023 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000002023 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000002023 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002023 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002023 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000002023 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002023 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000002023 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000002023 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.10% |
| C000002023 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000002023 [Member] | Equities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.70% |
| C000002029 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002029 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000002029 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002029 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000002029 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000002029 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000002029 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002029 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002029 [Member] | Church And Dwight Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002029 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002029 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002029 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000002029 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000002029 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002029 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002029 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000002029 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002029 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000002029 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000002029 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.10% |
| C000002029 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000002029 [Member] | Equities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.70% |
| C000002025 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002025 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000002025 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002025 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000002025 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000002025 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000002025 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002025 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002025 [Member] | Church And Dwight Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002025 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002025 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002025 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000002025 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000002025 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002025 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002025 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000002025 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002025 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000002025 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000002025 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.10% |
| C000002025 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000002025 [Member] | Equities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.70% |
| C000002034 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002034 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000002034 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002034 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000002034 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000002034 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000002034 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002034 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002034 [Member] | Church And Dwight Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002034 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002034 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002034 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000002034 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000002034 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002034 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002034 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000002034 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002034 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000002034 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000002034 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.10% |
| C000002034 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000002034 [Member] | Equities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.70% |
| C000002030 [Member] | Agilent Technologies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002030 [Member] | Accenture PLC A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| C000002030 [Member] | NVIDIA Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.80% |
| C000002030 [Member] | Alphabet Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000002030 [Member] | Visa Inc A [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000002030 [Member] | Apple Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000002030 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000002030 [Member] | Aon PLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000002030 [Member] | Church And Dwight Co Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000002030 [Member] | Microsoft Corp [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002030 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000002030 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000002030 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| C000002030 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000002030 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.80% |
| C000002030 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000002030 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000002030 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.40% |
| C000002030 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| C000002030 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37.10% |
| C000002030 [Member] | Money Market Funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000002030 [Member] | Equities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.70% |