Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Aug. 28, 2012
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	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. The annual fund operating expenses for Class B, Class C, Class R1, Class R2, Class R3, Class R4, and Class R5 shares are based on estimated "Other Expenses" for the current fiscal year expressed as a percentage of the fund's estimated average net assets during the period.    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 10 of the fund's prospectus and "Waivers of Sales Charges" on page I-13 of the fund's statement of additional information Part I.
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 70% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	70.00%
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	50,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	The annual fund operating expenses for Class B, Class C, Class R1, Class R2, Class R3, Class R4, and Class R5 shares are based on estimated "Other Expenses" for the current fiscal year expressed as a percentage of the fund's estimated average net assets during the period.
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 providing exposure to the commodities markets. The fund normally invests significantly in commodity-linked derivatives and debt instruments.  Commodities are assets with tangible properties, including oil, natural gas, agricultural products, and industrial and other precious metals. The fund's investments in commodity-linked derivatives provide exposure to the investment returns of the commodities markets without investing directly in commodities.    MFS primarily invests the fund's investments in commodity-linked derivatives in commodity-linked notes, but may also invest in other commodity-linked derivatives, such as commodity-linked futures, options, and swaps. In addition to direct investments in commodity-linked derivatives, MFS may also invest up to 25% of the fund's assets in a wholly-owned and controlled subsidiary ("Subsidiary") that will invest primarily in commodity-linked derivatives (such as commodity-linked futures, options, and swaps) and debt instruments.    MFS allocates the fund's investments in commodity-linked derivatives among a variety of different commodity sectors based on quantitative analysis.    Of the fund's investments in debt instruments, MFS generally invests substantially all of these investments in investment grade debt instruments.    MFS may invest the fund's assets in foreign securities.    The fund is a non-diversified fund. This means that MFS may invest a relatively large percentage of the fund's assets in a single issuer or a small number of issuers.    In addition to the commodity-linked derivatives described above, MFS may use derivatives for any investment purpose. To the extent MFS uses derivatives, MFS expects to use derivatives primarily to increase or decrease exposure to a particular market, segment of the market, or security, to increase or decrease interest rate or currency exposure, or as alternatives to direct investments. Derivatives include futures, forward contracts, options, structured securities, inverse floating rate instruments, and swaps.    MFS uses a bottom-up investment approach to buying and selling debt investments for the fund. Investments are selected primarily based on fundamental analysis of individual instruments and their issuers. Quantitative models that systematically evaluate instruments may also be considered.
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:    Commodity Risk:  The value of commodities may be more volatile than the value of equity securities or debt instruments and their value may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, or factors affecting a particular industry or commodity. The price of a commodity may be affected by demand/supply imbalances in the market for the commodity. To the extent the fund focuses its investments in a particular asset of the commodities market, the fund will be more susceptible to risks associated with that particular asset.    Commodity-Linked Note Risk:  Commodity-linked notes have characteristics of debt instruments and derivatives and are subject to the risks associated with investing in those types of investments. Commodity-linked notes can be highly volatile and less liquid than other types of investments. 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. Tax Risk:  In order to qualify as a regulated investment company (RIC) under the Internal Revenue Code, the fund must meet certain requirements regarding the source of its income, the diversification of its assets, and the distribution of its income. If the fund were to fail to qualify as a RIC and became subject to federal income tax, shareholders of the fund would be subject to the risk of diminished returns.    Interest Rate Risk:  The price of a debt instrument falls when interest rates rise and rises when interest rates fall. Instruments with longer maturities, or that do not pay current interest, are more sensitive to interest rate changes.    Credit Risk:  The price of a debt instrument depends, in part, on the credit quality of the issuer, borrower, counterparty, or underlying collateral or assets and the terms of the instrument. The price of a debt instrument can decline in response to changes in the financial condition of the issuer, borrower, counterparty, or underlying collateral or assets, or changes in specific or general market, economic, industry, political, regulatory, geopolitical, or other conditions. Foreign Risk:  Exposure to foreign markets through issuers or currencies can involve additional risks relating to market, economic, political, regulatory, geopolitical, or 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.    Prepayment/Extension Risk:  Instruments subject to prepayment and/or extension can reduce the potential for gain for the instrument's holders if the instrument is prepaid and increase the potential for loss if the maturity of the instrument is extended.    Inflation-Adjusted Debt Instruments Risk:  Interest payments on inflation-adjusted debt instruments can be unpredictable and vary based on the level of inflation. If inflation is negative, principal and income can both decline.    Municipal Risk:  The price of a municipal instrument can be volatile and significantly affected by adverse tax or court rulings, legislative or political changes, changes in specific or general market and economic conditions, and the financial condition of municipal issuers and insurers. Because many municipal instruments are issued to finance similar projects, conditions in these industries can significantly affect the fund and the overall municipal market. Non-Diversification Risk:  Because MFS may invest a relatively large percentage of the fund's assets in a single issuer or small number of issuers, the fund's performance could be closely tied to the value of that one issuer or issuers, and could be more volatile than the performance of diversified funds. Leveraging Risk:  Leverage involves investment exposure in an amount exceeding the initial investment. Leverage can cause increased volatility by magnifying gains or losses.    Investment Selection and Allocation Risk: MFS' investment analysis, its selection of investments, and its assessment of the risk/return potential of commodity sectors may not produce the intended results and 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.    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 to perform in accordance with the terms of the transaction.    Financial Services Exposure Risk:  Events that affect the financial services sector may have a significant adverse effect on the fund.    Liquidity Risk:  It may not be possible to sell certain investments, types of investments, and/or segments of the market at any particular time or at an acceptable price. Subsidiary Risk:  The Subsidiary will not be registered as an investment company under the Investment Company Act of 1940 (the "Act") and will not be subject to all of the investor protections of the Act. Changes in the laws impacting the fund or the Subsidiary could negatively affect the fund and its shareholders. By investing in the Subsidiary, the fund is exposed to all the risks associated with the Subsidiary's investments.
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 Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Because MFS may invest a relatively large percentage of the fund's assets in a single issuer or small number of issuers, the fund's performance could be closely tied to the value of that one issuer or issuers, and could be more volatile than the performance of diversified funds.
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]	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 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 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]	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, 2012 was (2.44)%. During the period(s) shown in the bar chart, the highest quarterly return was 4.17% (for the calendar quarter ended March 31, 2011) and the lowest quarterly return was (12.19)% (for the calendar quarter ended September 30, 2011).
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.
Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (for the Periods Ended December 31, 2011)
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | Dow Jones-UBS Commodity Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Index Comparison (Reflects no deduction for fees, expenses or taxes) Dow Jones-UBS Commodity Index
1 Year	rr_AverageAnnualReturnYear01	(13.32%)
Since Inception	rr_AverageAnnualReturnSinceInception	8.39%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | A
Risk Return [Abstract]	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	A
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]
Operating Expenses Column [Text]	rr_OperatingExpensesColumnName	A
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.08%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.08%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	679
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	899
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,136
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,816
Annual Return 2011	rr_AnnualReturn2011	(14.81%)
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, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(2.44%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest quarterly return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2011
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	4.17%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest quarterly return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(12.19%)
Label	rr_AverageAnnualReturnLabel	A Shares Returns Before Taxes
1 Year	rr_AverageAnnualReturnYear01	(19.71%)
Since Inception	rr_AverageAnnualReturnSinceInception	4.96%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | A | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	A Shares Returns After Taxes on Distributions
1 Year	rr_AverageAnnualReturnYear01	(23.23%)
Since Inception	rr_AverageAnnualReturnSinceInception	2.00%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | A | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	A Shares Returns After Taxes on Distributions and Sale of Fund Shares
1 Year	rr_AverageAnnualReturnYear01	(11.53%)
Since Inception	rr_AverageAnnualReturnSinceInception	2.99%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | B
Risk Return [Abstract]	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	B
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%
Operating Expenses Column [Text]	rr_OperatingExpensesColumnName	B
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses	rr_OtherExpensesOverAssets	0.08%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.83%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	586
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	876
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,190
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,951
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	186
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	576
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	990
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,951
Label	rr_AverageAnnualReturnLabel	B Shares Returns Before Taxes
1 Year	rr_AverageAnnualReturnYear01	(18.28%)
Since Inception	rr_AverageAnnualReturnSinceInception	5.88%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | C
Risk Return [Abstract]	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	C
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%
Operating Expenses Column [Text]	rr_OperatingExpensesColumnName	C
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses	rr_OtherExpensesOverAssets	0.08%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.83%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	286
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	576
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	990
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,148
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	186
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	576
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	990
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,148
Label	rr_AverageAnnualReturnLabel	C Shares Returns Before Taxes
1 Year	rr_AverageAnnualReturnYear01	(16.18%)
Since Inception	rr_AverageAnnualReturnSinceInception	8.17%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | I
Risk Return [Abstract]	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	I
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
Operating Expenses Column [Text]	rr_OperatingExpensesColumnName	I
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.08%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.83%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	85
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	265
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	460
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,025
Label	rr_AverageAnnualReturnLabel	I Shares Returns Before Taxes
1 Year	rr_AverageAnnualReturnYear01	(14.63%)
Since Inception	rr_AverageAnnualReturnSinceInception	9.25%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | R1
Risk Return [Abstract]	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	ALL R
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
Operating Expenses Column [Text]	rr_OperatingExpensesColumnName	R1
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses	rr_OtherExpensesOverAssets	0.08%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.83%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	186
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	576
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	990
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,148
Label	rr_AverageAnnualReturnLabel	R1 Shares Returns Before Taxes
1 Year	rr_AverageAnnualReturnYear01	(15.47%)
Since Inception	rr_AverageAnnualReturnSinceInception	8.17%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | R2
Risk Return [Abstract]	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	ALL R
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
Operating Expenses Column [Text]	rr_OperatingExpensesColumnName	R2
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other Expenses	rr_OtherExpensesOverAssets	0.08%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.33%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	135
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	421
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	729
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,601
Label	rr_AverageAnnualReturnLabel	R2 Shares Returns Before Taxes
1 Year	rr_AverageAnnualReturnYear01	(15.05%)
Since Inception	rr_AverageAnnualReturnSinceInception	8.71%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | R3
Risk Return [Abstract]	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	ALL R
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
Operating Expenses Column [Text]	rr_OperatingExpensesColumnName	R3
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.08%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.08%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	110
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	343
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	595
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,317
Label	rr_AverageAnnualReturnLabel	R3 Shares Returns Before Taxes
1 Year	rr_AverageAnnualReturnYear01	(14.84%)
Since Inception	rr_AverageAnnualReturnSinceInception	8.98%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | R4
Risk Return [Abstract]	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	ALL R
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
Operating Expenses Column [Text]	rr_OperatingExpensesColumnName	R4
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.08%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.83%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	85
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	265
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	460
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,025
Label	rr_AverageAnnualReturnLabel	R4 Shares Returns Before Taxes
1 Year	rr_AverageAnnualReturnYear01	(14.63%)
Since Inception	rr_AverageAnnualReturnSinceInception	9.25%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010
MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND | R5
Risk Return [Abstract]	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	ALL R
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
Operating Expenses Column [Text]	rr_OperatingExpensesColumnName	R5
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.08%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.83%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	85
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	265
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	460
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,025
Label	rr_AverageAnnualReturnLabel	R5 Shares Returns Before Taxes
1 Year	rr_AverageAnnualReturnYear01	(14.63%)
Since Inception	rr_AverageAnnualReturnSinceInception	9.25%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 02, 2010

[1] On shares purchased without an initial sales charge and redeemed within 18 months of purchase for shares purchased on or after August 1, 2012, and within 24 months of purchase for shares purchased prior to August 1, 2012.