Nov. 30, 2024 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Massachusetts Investors Growth Stock Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Massachusetts Investors Growth Stock Fund Summary of Key Information | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investment Objective | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
The fund’s investment objective is to seek capital appreciation. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fees and Expenses | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
This table describes the fees and expenses that you may pay when you buy, hold, and sell shares of the fund. Investors may also pay commissions or other fees to their financial intermediaries when they buy, hold, and sell shares of the fund, which are not reflected below. You may qualify for sales charge reductions if, with respect to Class A shares, you and certain members of your family invest, or agree to invest in the future, at least $50,000 in MFS funds. More information about these and other waivers and reductions is available from your financial intermediary and in “Sales Charges and Waivers and Reductions” on page 9 and “Appendix A – Waivers and Reductions of Sales Charges” on page A-1 of the fund’s prospectus. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Fees (fees paid directly from your investment): | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment): | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Example | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that: you invest $10,000 in the fund for the time periods indicated and you redeem your shares at the end of the time periods (unless otherwise indicated); your investment has a 5% return each year; and the fund’s operating expenses remain the same. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Although your actual costs will likely be higher or lower, under these assumptions your costs would be: | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Portfolio Turnover | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These transaction costs, which are not reflected in “Annual Fund Operating Expenses” or in the “Example,” affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 19% of the average value of its portfolio. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Principal Investment Strategies | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
MFS (Massachusetts Financial Services Company, the fund’s investment adviser) normally invests at least 80% of the fund’s net assets in stocks. Stocks include common stocks and other securities that represent an ownership interest (or right to acquire an ownership interest) in a company or other issuer. MFS focuses on investing the fund’s assets in the stocks of companies it believes to have above average earnings growth potential compared to other companies (growth companies). While MFS may invest the fund’s assets in securities of companies of any size, MFS primarily invests in securities of companies with large capitalizations. MFS may invest the fund’s assets in foreign securities. MFS normally invests the fund's assets across different industries and sectors, but MFS may invest a significant percentage of the fund's assets in issuers in a single industry or sector. MFS may invest a significant percentage of the fund’s assets in a single issuer or a small number of issuers. MFS uses an active bottom-up investment approach to buying and selling investments for the fund. Investments are selected primarily based on fundamental analysis of individual issuers. Quantitative screening tools that systematically evaluate issuers may also be considered. For purposes of the fund's 80% policy, net assets include the amount of any borrowings for investment purposes. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Principal Risks | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Performance Information | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
The bar chart and performance table below are intended to provide some indication of the risks of investing in the fund by showing changes in the fund’s performance over time and how the fund’s performance over time compares with that of (i) a broad measure of market performance and (ii) the performance of an additional index that the adviser believes more closely reflects the market segments in which the fund invests. The fund’s past performance (before and after taxes) does not necessarily indicate how the fund will perform in the future. Updated performance is available online at mfs.com or by calling 1-800-225-2606. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| The bar chart does not take into account any sales charges (loads) that you may be required to pay upon purchase or redemption of the fund’s shares. If these sales charges were included, they would reduce the returns shown. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Class A Bar Chart. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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During the period(s) shown in the bar chart, the highest quarterly return was 20.69% (for the calendar quarter ended June 30, 2020) and the lowest quarterly return was (17.81)% (for the calendar quarter ended March 31, 2020). | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Average Annual Total Returns (For the Periods Ended December 31, 2024) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Effective May 1, 2024, the Russell 3000® Index replaced the Russell 1000® Growth Index as a broad measure of market performance in accordance with new regulatory disclosure requirements. The fund continues to use the Russell 1000® Growth Index as an additional benchmark that MFS believes more closely reflects the market segments in which the fund invests. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your own tax situation, and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (IRAs). The after-tax returns are shown for only one of the fund’s classes of shares, and after-tax returns for the fund’s other classes of shares will vary from the returns shown. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||