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Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

MFS® Global Equity Fund Summary of Key Information

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund’s investment objective is to seek capital appreciation.

Expense [Heading]

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Fees and Expenses

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay when you buy and hold shares of the fund.

You may qualify for sales charge reductions if 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 or Reductions” on page 7 of the fund’s Prospectus and “Waivers of Sales Charges” on page H-1 of the fund’s Statement of Additional Information (“SAI”).

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment):

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

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 11% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge reductions if you and certain members of your family invest, or agree to invest in the future, at least $50,000 in MFS Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

Expense Example [Heading]

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Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

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.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Although your actual costs will likely be higher or lower, under these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

MFS (Massachusetts Financial Services Company, the fund’s investment adviser) normally invests at least 80% of the fund’s net assets in equity securities.

Equity securities include common stocks, preferred stocks, securities convertible into stocks, equity interests in real estate investment trusts (REITs), and depositary receipts for such securities.

In selecting investments for the fund, MFS is not constrained to any particular investment style. MFS may invest the fund’s assets in the stocks of companies it believes to have above average earnings growth potential compared to other companies (growth companies), in the stocks of companies it believes are undervalued compared to their perceived worth (value companies), or in a combination of growth and value companies.

While MFS may invest the fund’s assets in companies of any size, MFS primarily invests in companies with large capitalizations.

MFS may invest the fund’s assets in U.S. and foreign securities, including emerging market securities.

MFS normally allocates the fund’s investments across different countries and regions.

MFS may invest a large percentage of the fund’s assets in issuers in a single country, a small number of countries, or a particular geographic region.

MFS uses a bottom-up investment approach to buying and selling investments for the fund. Investments are selected primarily based on fundamental analysis of individual issuers. Quantitative models that systematically evaluate issuers may also be considered.

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

As with any mutual fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

The principal risks of investing in the fund are:

Stock Market/Company Risk: Stock markets are volatile and can decline significantly in response to issuer, market, economic, industry, political, regulatory, geopolitical, and other conditions, as well as to investor perceptions of these conditions. The price of an equity security can decrease significantly in response to these conditions, and these conditions can affect a single issuer or type of security, issuers within a broad market sector, industry or geographic region, or the market in general.

Foreign and Emerging Markets Risk: Exposure to foreign markets, especially emerging markets, through issuers or currencies can involve additional risks relating to market, economic, industry, political, regulatory, geopolitical, and other conditions. These factors can make foreign investments, especially those in emerging markets, more volatile and less liquid than U.S. investments. In addition, foreign markets can react differently to these conditions than the U.S. market. Emerging markets can have less developed markets, greater custody and operational risk, less developed legal, regulatory, and accounting systems, and greater political, social, and economic instability than developed markets.

Currency Risk: The value of foreign currencies relative to the U.S. dollar fluctuates in response to market, economic, industry, political, regulatory, geopolitical, and other conditions, and a decline in the value of a foreign currency versus the U.S. dollar reduces the value in U.S. dollars of investments denominated in that foreign currency.

Geographic Focus Risk: The fund’s performance will be closely tied to the market, currency, economic, political, regulatory, geopolitical, and other conditions in the countries or regions in which the fund’s assets are invested.

Liquidity Risk: It may be difficult to value, and it may not be possible to sell, certain investments, types of investments, and/or investments in certain segments of the market, and the fund may have to sell certain of these investments at a price or time that is not advantageous in order to meet redemptions or other cash needs.

Investment Selection Risk: MFS’ investment analysis and its selection of investments may not produce the intended results and/or can lead to an investment focus that results in the fund underperforming other funds with similar investment strategies and/or underperforming the markets in which the fund invests.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with any mutual fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

Bar Chart and Performance Table [Heading]

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Performance Information

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

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 a broad measure of market performance.

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.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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 a broad measure of market performance.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1-800-225-2606

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

mfs.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The fund’s past performance (before and after taxes) does not necessarily indicate how the fund will perform in the future.

Bar Chart [Heading]

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Class A Bar Chart.

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

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.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the period(s) shown in the bar chart, the highest quarterly return was 18.83% (for the calendar quarter ended June 30, 2009) and the lowest quarterly return was (18.24)% (for the calendar quarter ended December 31, 2008).

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest quarterly return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest quarterly return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

Performance Table Heading

rr_PerformanceTableHeading

Performance Table.

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(Reflects no deduction for fees, expenses, or taxes)

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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-deferred arrangements, such as 401(k) plans or individual retirement accounts.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

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.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

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-deferred arrangements, such as 401(k) plans or individual retirement accounts. 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.

rr_AverageAnnualReturnCaption

Average Annual Total Returns (For the Periods Ended December 31, 2014)

MSCI World Index

Risk/Return:

rr_RiskReturnAbstract

rr_AverageAnnualReturnLabel

Index Comparison (Reflects no deduction for fees, expenses, or taxes) MSCI World Index

Average Annual Returns, 1 Year

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Average Annual Returns, 5 Years

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Average Annual Returns, 10 Years

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A

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)

rr_MaximumDeferredSalesChargeOverOther

^[1]

rr_ManagementFeesOverAssets

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

rr_OtherExpensesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This contingent deferred sales charge (CDSC) applies to shares purchased without an initial sales charge and redeemed within 18 months of purchase.

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

Annual Return 2005

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Annual Return 2006

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Annual Return 2007

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Annual Return 2008

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Annual Return 2009

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Annual Return 2010

rr_AnnualReturn2010

Annual Return 2011

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Annual Return 2012

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Annual Return 2013

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Annual Return 2014

rr_AnnualReturn2014

rr_AverageAnnualReturnLabel

A Shares Returns Before Taxes

Average Annual Returns, 1 Year

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Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

A | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

rr_AverageAnnualReturnLabel

A Shares Returns After Taxes on Distributions

Average Annual Returns, 1 Year

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Average Annual Returns, 5 Years

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Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

A | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

rr_AverageAnnualReturnLabel

A Shares Returns After Taxes on Distributions and Sale of Fund Shares

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

B

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)

rr_MaximumDeferredSalesChargeOverOther

rr_ManagementFeesOverAssets

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

rr_OtherExpensesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

rr_AverageAnnualReturnLabel

B Shares Returns Before Taxes

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

C

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)

rr_MaximumDeferredSalesChargeOverOther

rr_ManagementFeesOverAssets

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

rr_OtherExpensesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

rr_AverageAnnualReturnLabel

C Shares Returns Before Taxes

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

I

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

rr_AverageAnnualReturnLabel

I Shares Returns Before Taxes

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

R1

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

rr_OtherExpensesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

rr_AverageAnnualReturnLabel

R1 Shares Returns Before Taxes

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

R2

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

rr_OtherExpensesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

rr_AverageAnnualReturnLabel

R2 Shares Returns Before Taxes

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

R3

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

rr_OtherExpensesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

rr_AverageAnnualReturnLabel

R3 Shares Returns Before Taxes

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

R4

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

rr_AverageAnnualReturnLabel

R4 Shares Returns Before Taxes

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

R5

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

rr_AverageAnnualReturnLabel

R5 Shares Returns Before Taxes

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

Average Annual Returns, 10 Years

rr_AverageAnnualReturnYear10

[1]	This contingent deferred sales charge (CDSC) applies to shares purchased without an initial sales charge and redeemed within 18 months of purchase.