MFS COMMODITY STRATEGY FUND (Prospectus Summary) | MFS COMMODITY STRATEGY FUND

Summary of Key Information

Investment Objective

The fund's investment objective is to seek total return.

Fees and Expenses

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 (fees paid directly from your investment):

Shareholder Fees MFS COMMODITY STRATEGY FUND	A		B	C	I	R1	R2	R3	R4	R5
Shareholder Fees Column [Text]	A		B	C	I	ALL R	ALL R	ALL R	ALL R	ALL R
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.75%		none	none	none	none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)	1.00%	[1]	4.00%	1.00%	none	none	none	none	none	none

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

Annual Fund Operating Expenses MFS COMMODITY STRATEGY FUND	A	B	C	I	R1	R2	R3	R4	R5
Operating Expenses Column [Text]	A	B	C	I	R1	R2	R3	R4	R5
Management Fee	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%
Distribution and/or Service (12b-1) Fees	0.25%	1.00%	1.00%	none	1.00%	0.50%	0.25%	none	none
Other Expenses	0.08%	0.08%	0.08%	0.08%	0.08%	0.08%	0.08%	0.08%	0.08%
Total Annual Fund Operating Expenses	1.08%	1.83%	1.83%	0.83%	1.83%	1.33%	1.08%	0.83%	0.83%

Example

This example is intended to help you compare the cost of investing in the fund
with the cost of investing in other mutual funds.
  
The example assumes that: you invest $10,000 in the fund for the time periods
indicated and you redeem your shares at the end of the time periods (unless
otherwise indicated); your investment has a 5% return each year; and the fund's
operating expenses remain the same.

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

Expense Example MFS COMMODITY STRATEGY FUND (USD $)	Expense Example, By Year, Column [Text]	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
A	Class A Shares	679	899	1,136	1,816
B	Class B Shares assuming redemption at end of period	586	876	1,190	1,951
C	Class C Shares assuming redemption at end of period	286	576	990	2,148
I	Class I Shares	85	265	460	1,025
R1	Class R1 Shares	186	576	990	2,148
R2	Class R2 Shares	135	421	729	1,601
R3	Class R3 Shares	110	343	595	1,317
R4	Class R4 Shares	85	265	460	1,025
R5	Class R5 Shares	85	265	460	1,025

Expense Example, No Redemption MFS COMMODITY STRATEGY FUND (USD $)	Expense Example, No Redemption, By Year, Column [Text]	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
B	Class B Shares no redemption at end of period	186	576	990	1,951
C	Class C Shares no redemption at end of period	186	576	990	2,148

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells
securities (or "turns over" its portfolio). A higher portfolio turnover rate
may indicate higher transaction costs and may result in higher taxes when
shares are held in a taxable account. These transaction costs, which are not
reflected in "Annual Fund Operating Expenses" or in the "Example," affect the
fund's performance.  During the most recent fiscal year, the fund's portfolio
turnover rate was 70% of the average value of its portfolio.

Principal Investment Strategies

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.

Principal Risks

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.

Performance Information

The bar chart and performance table below are intended to provide some
indication of the risks of investing in the fund by showing 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.

The bar chart does not take into account any sales charges (loads) that you may be
required to pay upon purchase or redemption of the fund's shares. If these sales
charges were included, they would reduce the returns shown.

Class A Bar Chart.

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.

Average Annual Total Returns (for the Periods Ended December 31, 2011)

Average Annual Total Returns MFS COMMODITY STRATEGY FUND	Label	1 Year	Since Inception	Inception Date
A	A Shares Returns Before Taxes	(19.71%)	4.96%	Jun. 02, 2010
B	B Shares Returns Before Taxes	(18.28%)	5.88%	Jun. 02, 2010
C	C Shares Returns Before Taxes	(16.18%)	8.17%	Jun. 02, 2010
I	I Shares Returns Before Taxes	(14.63%)	9.25%	Jun. 02, 2010
R1	R1 Shares Returns Before Taxes	(15.47%)	8.17%	Jun. 02, 2010
R2	R2 Shares Returns Before Taxes	(15.05%)	8.71%	Jun. 02, 2010
R3	R3 Shares Returns Before Taxes	(14.84%)	8.98%	Jun. 02, 2010
R4	R4 Shares Returns Before Taxes	(14.63%)	9.25%	Jun. 02, 2010
R5	R5 Shares Returns Before Taxes	(14.63%)	9.25%	Jun. 02, 2010
After Taxes on Distributions A	A Shares Returns After Taxes on Distributions	(23.23%)	2.00%	Jun. 02, 2010
After Taxes on Distributions and Sales A	A Shares Returns After Taxes on Distributions and Sale of Fund Shares	(11.53%)	2.99%	Jun. 02, 2010
Dow Jones-UBS Commodity Index	Index Comparison (Reflects no deduction for fees, expenses or taxes) Dow Jones-UBS Commodity Index	(13.32%)	8.39%	Jun. 02, 2010

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.

[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.