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Label Element Value
MFS Low Volatility Global Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

SUPPLEMENT TO THE PROSPECTUS

Supplement dated April 1, 2023, to the Prospectus dated December 29, 2022.

  

  

MFS® Low Volatility Global Equity Fund

 

Effective immediately, the section entitled “Performance Information” under the main heading entitled “Summary of Key Information” is restated in its entirety as follows:
Risk/Return [Heading] rr_RiskReturnHeading MFS® Low Volatility Global Equity Fund
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading 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 and one or more other measures of performance for markets in which the fund may invest.

 

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 and one or more other measures of performance for markets in which the fund may invest.
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] rr_BarChartHeading 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 11.25% (for the calendar quarter ended June 30, 2020) and the lowest quarterly return was (18.01)% (for the calendar quarter ended March 31, 2020). 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.25%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.01%)
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-advantaged 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-advantaged 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.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (For the Periods Ended December 31, 2022)
MFS Low Volatility Global Equity Fund | MSCI All Country World Index (net div)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (18.36%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.23%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.77%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013
MFS Low Volatility Global Equity Fund | MSCI All Country World Minimum Volatility Index (net div)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (10.31%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.57%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.88%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013
MFS Low Volatility Global Equity Fund | A  
Risk/Return: rr_RiskReturnAbstract  
Annual Return 2014 rr_AnnualReturn2014 9.85%
Annual Return 2015 rr_AnnualReturn2015 1.11%
Annual Return 2016 rr_AnnualReturn2016 5.72%
Annual Return 2017 rr_AnnualReturn2017 18.15%
Annual Return 2018 rr_AnnualReturn2018 (2.61%)
Annual Return 2019 rr_AnnualReturn2019 20.32%
Annual Return 2020 rr_AnnualReturn2020 5.11%
Annual Return 2021 rr_AnnualReturn2021 16.62%
Annual Return 2022 rr_AnnualReturn2022 (8.41%)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (13.68%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.40%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.39%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013
MFS Low Volatility Global Equity Fund | A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (14.43%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.46%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.70%
MFS Low Volatility Global Equity Fund | A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (7.48%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.47%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.12%
MFS Low Volatility Global Equity Fund | B  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (12.59%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.51%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.35%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013
MFS Low Volatility Global Equity Fund | C  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (9.94%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.87%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.35%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013
MFS Low Volatility Global Equity Fund | I  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.17%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.90%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.33%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013
MFS Low Volatility Global Equity Fund | R1  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (9.09%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.84%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.26%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013
MFS Low Volatility Global Equity Fund | R2  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.59%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.37%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.80%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013
MFS Low Volatility Global Equity Fund | R3  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.34%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.65%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.07%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013
MFS Low Volatility Global Equity Fund | R4  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.11%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.91%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.33%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013
MFS Low Volatility Global Equity Fund | R6  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.04%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.00%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.39%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 05, 2013