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MFS Managed Wealth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading MFS Managed Wealth 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 total return.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay when you buy and hold shares of the fund. Investors may also pay commissions or other fees to their financial intermediaries when they buy and hold 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 12 and “Appendix A – Waivers and Reductions of Sales Charges” on page A-1 of the fund’s prospectus.

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):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Sep. 30, 2021
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 28% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.00%
Expense Example [Heading] rr_ExpenseExampleHeading 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) seeks to achieve the fund’s objective by generating returns from (1) a strategic allocation to three MFS equity funds, referred to as underlying funds, and (2) a tactical asset allocation overlay primarily using derivative instruments to seek to decrease the volatility of the fund’s returns by reducing the fund’s exposure to the equity and/or currency markets as represented by the underlying funds and also to potentially expose the fund to asset classes and/or markets in which the underlying funds have little or no exposure (e.g., high income debt instruments).  In addition, MFS may use derivatives to seek to limit the fund’s exposure to certain extreme market events.

 

Derivatives include futures, forward contracts, options, and swaps.

 

It is expected that the fund will generally have lower volatility than that of the overall equity market.

 

A committee of portfolio managers is responsible for selecting the underlying funds, determining the target strategic allocations to the underlying funds, and determining the fund’s tactical allocation overlay.

 

Strategic Fund Allocation:  The underlying funds are selected by the committee of portfolio managers based on underlying fund classifications, historical risk, performance, and other factors.  MFS expects the fund’s target allocation to be equally weighted among the following underlying funds: MFS Growth Fund, MFS Institutional International Equity Fund, and MFS Value Fund.

 

A portion of the fund’s assets (approximately 10%-15%) will be held in cash due to asset coverage and collateral requirements for the fund’s investments in derivatives, purchase and redemption activity, and other short term cash needs.

 

Tactical Asset Allocation Overlay:  MFS implements the tactical asset allocation overlay primarily through the use of derivative instruments based on the committee of portfolio managers’ assessment of the relative attractiveness of asset classes and markets.  In seeking to reduce the fund’s volatility, MFS decreases the fund’s exposure to the equity and/or currency markets represented by the underlying funds.  In addition, MFS may expose the fund to asset classes and/or markets in which the underlying funds have little or no exposure (e.g., high income debt instruments or small cap equity securities) when the committee of portfolio managers believes such asset classes or markets are relatively attractive.

 

After taking into account the tactical asset allocation overlay, the fund’s total market exposure will normally be between 10% and 90% of the fund’s assets.  (The fund’s total market exposure includes the fund’s exposure to the equity market through investment in the underlying funds and exposure to any other markets through the tactical overlay.)  When the committee of portfolio managers’ assessment of the relative attractiveness of asset classes and markets is neutral, the fund’s exposure to the equity market is expected to be approximately 50% of the fund’s assets.

 

After taking into account the tactical overlay, the fund may have significant exposure to issuers in a single sector, industry, country, or region.

 

MFS’ tactical asset allocation process for the fund will typically make extensive use of derivatives.

 

In light of the fund’s principal investment strategies described above, MFS believes it is reasonable to measure the fund’s performance (net of fund expenses) over a full market cycle relative to the performance of (i) the ICE BofA 0-3 Month U.S. Treasury Bill Index plus 2% to 4% and (ii) the Standard & Poor’s 500 Stock Index. MFS does not seek to achieve a specific rate of return in managing the fund and there is no assurance that the fund will outperform the ICE BofA 0-3 Month U.S. Treasury Bill Index or the Standard & Poor’s 500 Stock Index over the long term or for any year or period of years.

Risk [Heading] 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:

 

Investment Strategy Risk:  The fund’s strategy to reduce its exposure to the equity and/or currency markets represented by the underlying funds and to potentially expose the fund to asset classes and/or markets in which the underlying funds have little or no exposure may not produce the intended results.  There is no assurance that the fund will be less volatile than the overall equity market over the long term or for any year or period of years.  In addition, the strategies MFS may implement to limit the fund’s exposure to certain extreme market events may not work as intended, and the costs associated with such strategies will reduce the fund’s returns.  It is expected that the fund will generally underperform the equity markets during periods of strong, rising equity markets.

 

Allocation Risk:  MFS’ assessment of the risk/return potential of asset classes and underlying funds, and the resulting allocation among asset classes and underlying funds, 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.

 

Underlying Funds Risk:  MFS’ strategy of investing in underlying funds exposes the fund to the risks of the underlying funds. Each underlying fund pursues its own investment objective and strategies and may not achieve its objective.  In addition, shareholders of the fund will indirectly bear the fees and expenses of the underlying funds.

 

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.

 

Equity Market Risk/Company Risk:  Equity markets are volatile and can decline significantly in response to, or investor perceptions of, issuer, market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions.  These conditions can affect a single issuer or type of security, issuers within a broad market sector, industry or geographic region, or the equity markets in general.  Certain events can have a dramatic adverse effect on equity markets and may lead to periods of high volatility in an equity market or a segment of an equity market.

 

Foreign Risk:  Exposure to foreign markets through issuers or currencies can involve additional risks relating to market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions. These factors can make foreign investments, especially those tied economically to 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 Risk:  Investments tied economically to emerging markets, especially frontier markets, can involve additional and greater risks than the risks associated with investments in developed foreign markets.  Emerging markets can have less developed markets, greater custody and operational risk, less developed legal, regulatory, and accounting systems, and greater political, social, geopolitical, 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, environmental, public health, and other conditions, and changes in currency exchange rates impact the financial condition of companies or other issuers and may change the value in U.S. dollars of investments denominated in foreign currencies.

Focus Risk:  Issuers in a single industry, sector, country, or region can react similarly to market, currency, political, economic, regulatory, geopolitical, environmental, public health, and other conditions, and the fund’s performance will be affected by the conditions in the industries, sectors, countries and regions to which the fund is exposed.

 

Growth Company Risk:  The stocks of growth companies can be more sensitive to the company’s earnings and more volatile than the market in general.

 

Value Company Risk:  The stocks of value companies can continue to be undervalued for long periods of time and not realize their expected value and can be more volatile than the market in general.

 

Derivatives Risk:  Derivatives can be highly volatile and involve risks in addition to the risks of the underlying indicator(s) on which the derivative is based. Gains or losses from derivatives can be substantially greater than the derivatives’ original cost.  Derivatives can involve leverage.

 

Debt Market Risk:  Debt markets can be volatile and can decline significantly in response to, or investor perceptions of, issuer, market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions.  These conditions can affect a single instrument, issuer, or borrower, a particular type of instrument, issuer, or borrower, a segment of the debt markets or the debt markets generally. Certain events can have a dramatic adverse effect on debt markets and may lead to periods of high volatility and reduced liquidity in a debt market or segment of a debt market.

 

Interest Rate Risk:  In general, the price of a debt instrument falls when interest rates rise and rises when interest rates fall. Interest rate risk is generally greater for instruments with longer maturities, or that do not pay current interest.

 

Credit Risk:  The price of a debt instrument depends, in part, on the credit quality of the issuer, borrower, counterparty, or other entity responsible for payment, or underlying collateral or assets and the terms of the instrument. The price of a debt instrument can decline in response to changes in, or perceptions of, the financial condition of the issuer, borrower, counterparty, or other entity, or underlying collateral or assets, or changes in, or perceptions of, specific or general market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions.

 

Below investment grade quality debt instruments (commonly referred to as “high yield securities” or “junk bonds”) can involve a substantially greater risk of default or can already be in default, and their values can decline significantly. Below investment grade quality debt instruments are regarded as having predominantly speculative characteristics. Below investment grade quality debt instruments tend to be more sensitive to adverse news about the issuer, or the market or economy in general, than higher quality debt instruments.

 

Leveraging Risk:  Leverage involves investment exposure in an amount exceeding the initial investment. Leverage can cause increased volatility by magnifying gains or losses.

 

Counterparty and Third Party Risk:  Transactions involving a counterparty or third party other than the issuer of the instrument are subject to the credit risk of the counterparty or third party, and to the counterparty’s or third party’s ability or willingness to perform in accordance with the terms of the transaction.

 

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 prices or times that are not advantageous in order to meet redemptions or other cash needs.

 

Large Shareholder Risk: From time to time, shareholders of the fund (which may include institutional investors, financial intermediaries, or other MFS funds) may make relatively large redemptions or purchases of fund shares.  These transactions may cause the fund to sell securities or invest additional cash, as the case may be, at disadvantageous prices.  Redemptions of a large number of shares also may increase transaction costs or have adverse tax consequences for shareholders of the fund by requiring a sale of portfolio securities.

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 [Text] rr_RiskNotInsured 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] 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

The total return for the six-month period ended June 30, 2020, was 3.67%. During the period(s) shown in the bar chart, the highest quarterly return was 3.97% (for the calendar quarter ended March 31, 2019) and the lowest quarterly return was (2.07)% (for the calendar quarter ended September 30, 2015).

Year to Date Return, Label rr_YearToDateReturnLabel The total return for the six-month period ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.67%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.97%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.07%)
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 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, 2019)
MFS Managed Wealth Fund | ICE BofA 0-3 Month U.S. Treasury Bill Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.21%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.02%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.93%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
MFS Managed Wealth Fund | Standard & Poor’s 500 Stock Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 31.49%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.70%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 11.77%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
MFS Managed Wealth Fund | A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [1]
Management Fee rr_ManagementFeesOverAssets 0.35%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.60%
Acquired (Underlying) Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.70%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.28%) [2]
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.42%
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 Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 711
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,054
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,420
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,446
Annual Return 2015 rr_AnnualReturn2015 1.10%
Annual Return 2016 rr_AnnualReturn2016 (1.16%)
Annual Return 2017 rr_AnnualReturn2017 6.67%
Annual Return 2018 rr_AnnualReturn2018 1.95%
Annual Return 2019 rr_AnnualReturn2019 8.67%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.42%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.17%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.06%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
MFS Managed Wealth Fund | A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.30%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.91%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.79%
MFS Managed Wealth Fund | A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.52%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.64%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.56%
MFS Managed Wealth Fund | 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_MaximumDeferredSalesChargeOverOfferingPrice 4.00%
Management Fee rr_ManagementFeesOverAssets 0.35%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.60%
Acquired (Underlying) Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.45%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.28%) [2]
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 2.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 620
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,037
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,480
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,580
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 220
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 737
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,280
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,580
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.70%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.12%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.07%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
MFS Managed Wealth Fund | 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_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fee rr_ManagementFeesOverAssets 0.35%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.60%
Acquired (Underlying) Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.45%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.28%) [2]
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 2.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 320
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 737
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,280
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,765
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 220
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 737
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,280
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,765
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.74%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.49%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.24%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
MFS Managed Wealth Fund | 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_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fee rr_ManagementFeesOverAssets 0.35%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.60%
Acquired (Underlying) Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.45%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.28%) [2]
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 119
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 431
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 766
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,711
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.70%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.51%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.26%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
MFS Managed Wealth Fund | 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_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fee rr_ManagementFeesOverAssets 0.35%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.60%
Acquired (Underlying) Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.45%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.28%) [2]
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 2.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 220
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 737
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,280
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,765
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.70%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.48%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.24%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
MFS Managed Wealth Fund | 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_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fee rr_ManagementFeesOverAssets 0.35%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.60%
Acquired (Underlying) Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.95%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.28%) [2]
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 170
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 585
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,026
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,252
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.24%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.00%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.75%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
MFS Managed Wealth Fund | 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_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fee rr_ManagementFeesOverAssets 0.35%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.60%
Acquired (Underlying) Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.70%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.28%) [2]
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.42%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 145
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 508
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 897
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,985
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.46%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.26%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.01%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
MFS Managed Wealth Fund | 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_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fee rr_ManagementFeesOverAssets 0.35%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.60%
Acquired (Underlying) Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.45%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.28%) [2]
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 119
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 431
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 766
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,711
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.81%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.51%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.26%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
MFS Managed Wealth Fund | R6  
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_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fee rr_ManagementFeesOverAssets 0.35%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.55%
Acquired (Underlying) Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.40%
Fee Reductions and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.26%) [2]
Total Annual Fund Operating Expenses After Fee Reductions and/or Expense Reimbursements rr_NetExpensesOverAssets 1.14%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 116
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 418
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 741
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,657
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.82%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.53%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.28%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2014
[1] This contingent deferred sales charge (CDSC) applies to shares purchased without an initial sales charge and redeemed within 18 months of purchase.
[2] Massachusetts Financial Services Company has agreed in writing to bear the fund’s expenses, excluding interest, taxes, extraordinary expenses, brokerage and transaction costs, and investment-related expenses (such as interest and borrowing expenses incurred in connection with the fund’s investment activity, and fees and expenses associated with investments in investment companies and other similar investment vehicles), such that “Total Annual Fund Operating Expenses” do not exceed 0.91% of the class’ average daily net assets annually for each of Class A and Class R3 shares, 1.66% of the class’ average daily net assets annually for each of Class B, Class C, and Class R1 shares, 0.66% of the class’ average daily net assets annually for each of Class I and Class R4 shares, 1.16% of the class’ average daily net assets annually for Class R2 shares, and 0.63% of the class’ average daily net assets annually for Class R6 shares. (“Other Expenses” include 0.01% of interest and/or investment related expenses incurred in connection with the fund’s investment activity which are excluded from the expense limitation described in the prior sentence.) This written agreement will continue until modified by the fund’s Board of Trustees, but such agreement will continue until at least September 30, 2021.