0001104659-13-055227.txt : 20130719 0001104659-13-055227.hdr.sgml : 20130719 20130719070226 ACCESSION NUMBER: 0001104659-13-055227 CONFORMED SUBMISSION TYPE: 485BPOS PUBLIC DOCUMENT COUNT: 8 FILED AS OF DATE: 20130719 DATE AS OF CHANGE: 20130719 EFFECTIVENESS DATE: 20130719 FILER: COMPANY DATA: COMPANY CONFORMED NAME: MFS SERIES TRUST XIII CENTRAL INDEX KEY: 0000356349 IRS NUMBER: 000000000 STATE OF INCORPORATION: MA FISCAL YEAR END: 0331 FILING VALUES: FORM TYPE: 485BPOS SEC ACT: 1933 Act SEC FILE NUMBER: 002-74959 FILM NUMBER: 13975897 BUSINESS ADDRESS: STREET 1: 111 HUNTINGTON AVENUE STREET 2: 24TH FLOOR CITY: BOSTON STATE: MA ZIP: 02199 BUSINESS PHONE: 18006372929 MAIL ADDRESS: STREET 1: 111 HUNTINGTON AVENUE STREET 2: 24TH FLOOR CITY: BOSTON STATE: MA ZIP: 02199 FORMER COMPANY: FORMER CONFORMED NAME: MFS GOVERNMENT SECURITIES FUND DATE OF NAME CHANGE: 19930408 FORMER COMPANY: FORMER CONFORMED NAME: MFS GOVERNMENT GUARANTEED SECURITIES TRUST DATE OF NAME CHANGE: 19910522 FORMER COMPANY: FORMER CONFORMED NAME: WORKING CAPITAL TRUST DATE OF NAME CHANGE: 19840529 FILER: COMPANY DATA: COMPANY CONFORMED NAME: MFS SERIES TRUST XIII CENTRAL INDEX KEY: 0000356349 IRS NUMBER: 000000000 STATE OF INCORPORATION: MA FISCAL YEAR END: 0331 FILING VALUES: FORM TYPE: 485BPOS SEC ACT: 1940 Act SEC FILE NUMBER: 811-03327 FILM NUMBER: 13975898 BUSINESS ADDRESS: STREET 1: 111 HUNTINGTON AVENUE STREET 2: 24TH FLOOR CITY: BOSTON STATE: MA ZIP: 02199 BUSINESS PHONE: 18006372929 MAIL ADDRESS: STREET 1: 111 HUNTINGTON AVENUE STREET 2: 24TH FLOOR CITY: BOSTON STATE: MA ZIP: 02199 FORMER COMPANY: FORMER CONFORMED NAME: MFS GOVERNMENT SECURITIES FUND DATE OF NAME CHANGE: 19930408 FORMER COMPANY: FORMER CONFORMED NAME: MFS GOVERNMENT GUARANTEED SECURITIES TRUST DATE OF NAME CHANGE: 19910522 FORMER COMPANY: FORMER CONFORMED NAME: WORKING CAPITAL TRUST DATE OF NAME CHANGE: 19840529 0000356349 S000000693 MFS Government Securities Fund C000002006 I MGSIX C000002007 A MFGSX C000002008 R4 MFGJX C000002012 B MFGBX C000002013 C MFGDX C000002015 R1 MFGGX C000002017 R2 MGVSX C000002018 R3 MFGHX C000117927 R5 MFGKX 0000356349 S000012219 MFS Diversified Income Fund C000033358 A DIFAX C000033359 C DIFCX C000033360 I DIFIX C000068409 R1 DIFDX C000068410 R2 DIFEX C000068411 R3 DIFFX C000068412 R4 DIFGX C000117928 R5 DIFHX 0000356349 S000024971 MFS Global Real Estate Fund C000074269 A MGLAX C000074270 B C000074271 C C000074272 I MGLIX C000074273 R1 C000074274 R2 C000074275 R3 C000074276 R4 C000117929 R5 MGLRX 0000356349 S000032712 MFS New Discovery Value Fund C000100956 A NDVAX C000100957 B NDVBX C000100958 C NDVCX C000100959 I NDVIX C000100960 R1 NDVRX C000100961 R2 NDVSX C000100962 R3 NDVTX C000100963 R4 NDVUX C000117930 R5 NDVVX 485BPOS 1 a13-14714_8485bpos.htm POST-EFFECTIVE AMENDMENT FILED PURSUANT TO SECURITIES ACT RULE 485(B)

 

As filed with the Securities and Exchange Commission on July 19, 2013

1933 Act File No. 2-74959  

1940 Act File No. 811-3327

 

 

 

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.  20549

 


 

FORM N-1A

 

REGISTRATION STATEMENT

UNDER THE SECURITIES ACT OF 1933

 

POST-EFFECTIVE AMENDMENT NO. 54

 

AND

 

REGISTRATION STATEMENT UNDER

THE INVESTMENT COMPANY ACT OF 1940

 

AMENDMENT NO. 49

 

MFS® SERIES TRUST XIII

(Exact name of Registrant as specified in Charter)

 

111 Huntington Avenue, Boston, Massachusetts  02199-7618

(Address of principal executive offices)

 

Registrant’s Telephone Number, Including Area Code: 617-954-5000

 

Susan S. Newton, Massachusetts Financial Services Company

111 Huntington Avenue, Boston, Massachusetts  02199-7618

(Name and Address of Agent for Service)

 

Approximate Date of Proposed Public Offering:

It is proposed that this filing will become effective (check appropriate box)

 

x immediately upon filing pursuant to paragraph (b)

o on [date] pursuant to paragraph (b)

o 60 days after filing pursuant to paragraph (a)(i)

o on [date] pursuant to paragraph (a)(i)

o 75 days after filing pursuant to paragraph (a)(ii)

o on [date] pursuant to paragraph (a)(ii) of rule 485.

 

If appropriate, check the following box:

o this post-effective amendment designates a new effective date for a previously filed post-effective amendment

 

 

 



 

SIGNATURES

 

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-Effective Amendment to the Registration Statement to be signed on its behalf by the undersigned, thereto duly authorized, in the City of Boston and The Commonwealth of Massachusetts on the 19th day of July 2013.

 

 

MFS® SERIES TRUST XIII

 

 

 

 

 

By:

JOHN M. CORCORAN*

 

Name:

John M. Corcoran

 

Title:

President

 

 

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to its Registration Statement has been signed below by the following persons in the capacities indicated on July 19, 2013.

 

SIGNATURE

 

TITLE

 

 

 

JOHN M. CORCORAN*

 

President (Principal Executive Officer)

John M. Corcoran

 

 

 

 

 

 

 

 

DAVID L. DILORENZO*

 

Principal Financial Officer and Accounting Officer

David L. DiLorenzo

 

 

 

 

 

 

 

 

ROBERT E. BUTLER*

 

Trustee

Robert E. Butler

 

 

 

 

 

 

 

 

MAUREEN R. GOLDFARB*

 

Trustee

Maureen R. Goldfarb

 

 

 

 

 

 

 

 

DAVID H. GUNNING*

 

Trustee

David H. Gunning

 

 

 

 

 

 

 

 

WILLIAM R. GUTOW*

 

Trustee

William R. Gutow

 

 

 



 

MICHAEL HEGARTY*

 

Trustee

Michael Hegarty

 

 

 

 

 

 

 

 

JOHN P. KAVANAUGH*

 

Trustee

John P. Kavanaugh

 

 

 

 

 

 

 

 

ROBERT J. MANNING*

 

Trustee

Robert J. Manning

 

 

 

 

 

 

 

 

J. DALE SHERRATT*

 

Trustee

J. Dale Sherratt

 

 

 

 

 

 

 

 

LAURIE J. THOMSEN*

 

Trustee

Laurie J. Thomsen

 

 

 

 

 

 

 

 

ROBERT W. UEK*

 

Trustee

Robert W. Uek

 

 

 

 

 

 

 

*By:

SUSAN S. NEWTON

 

 

Name:

Susan S. Newton

 

 

 

as Attorney-in-fact

 

 

 

 

 

Executed by Susan S. Newton on behalf of those indicated pursuant to a Power of Attorney, dated December 7, 2012 (Trustees) and a Power of Attorney, dated December 7, 2012 (Corcoran) (DiLorenzo); filed herewith.

 



 

MFS Series Trust I

MFS Series Trust II

MFS Series Trust III

MFS Series Trust IV

MFS Series Trust V

MFS Series Trust VI

MFS Series Trust VII

MFS Series Trust VIII

MFS Series Trust IX

MFS Series Trust X

MFS Series Trust XI

MFS Series Trust XII

MFS Series Trust XIII

MFS Series Trust XIV

MFS Series Trust XV

MFS Series Trust XVI

Massachusetts Investors Growth Stock Fund

Massachusetts Investors Trust

MFS Institutional Trust

MFS Municipal Series Trust

MFS Variable Insurance Trust

MFS Variable Insurance Trust II

MFS Variable Insurance Trust III

MFS California Municipal Fund

MFS Charter Income Trust

MFS Government Markets Income Trust

MFS High Income Municipal Trust

MFS High Yield Municipal Trust

MFS InterMarket Income Trust I

MFS Intermediate High Income Fund

MFS Intermediate Income Trust

MFS Investment Grade Municipal Trust

MFS Multimarket Income Trust

MFS Municipal Income Trust

MFS Special Value Trust

 

(each a “Registrant”)

 

POWER OF ATTORNEY

 

The undersigned, a Trustee of each of the above-mentioned Registrants, hereby severally constitutes and appoints Mark N. Polebaum, Susan S. Newton,

 



 

Christopher R. Bohane, Thomas H. Connors, Brian E. Langenfeld and Susan A. Pereira, and each of them singly, as true and lawful attorneys, with full power to them and each of them to sign for each of the undersigned, in the names of, and in the capacities indicated below, any Registration Statement and any and all amendments thereto and to file the same with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission for the purpose of registering the Registrant as a management investment company under the Investment Company Act of 1940 and/or the shares issued by the Registrant under the Securities Act of 1933 granting unto my said attorneys, and each of them, acting alone, full power and authority to do and perform each and every act and thing requisite or necessary or desirable to be done in the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys or any of them may lawfully do or cause to be done by virtue thereof.

 

IN WITNESS WHEREOF, the undersigned have hereunto set their hand on this 7th day of December, 2012.

 

ROBERT E. BUTLER

 

Trustee

Robert E. Butler

 

 

 

 

 

 

 

 

MAUREEN R. GOLDFARB

 

Trustee

Maureen R. Goldfarb

 

 

 

 

 

 

 

 

DAVID H. GUNNING

 

Trustee

David H. Gunning

 

 

 

 

 

 

 

 

WILLIAM R. GUTOW

 

Trustee

William R. Gutow

 

 

 

 

 

 

 

 

MICHAEL HEGARTY

 

Trustee

Michael Hegarty

 

 

 

 

 

 

 

 

JOHN P. KAVANAUGH

 

Trustee

John P. Kavanaugh

 

 

 



 

ROBERT J. MANNING

 

Trustee

Robert J. Manning

 

 

 

 

 

 

 

 

J. DALE SHERRATT

 

Trustee

J. Dale Sherratt

 

 

 

 

 

 

 

 

LAURIE J. THOMSEN

 

Trustee

Laurie J. Thomsen

 

 

 

 

 

 

 

 

ROBERT W. UEK

 

Trustee

Robert W. Uek

 

 

 



 

MFS Series Trust I

MFS Series Trust II

MFS Series Trust III

MFS Series Trust IV

MFS Series Trust V

MFS Series Trust VI

MFS Series Trust VII

MFS Series Trust VIII

MFS Series Trust IX

MFS Series Trust X

MFS Series Trust XI

MFS Series Trust XII

MFS Series Trust XIII

MFS Series Trust XIV

MFS Series Trust XV

MFS Series Trust XVI

Massachusetts Investors Growth Stock Fund

Massachusetts Investors Trust

MFS Institutional Trust

MFS Municipal Series Trust

MFS Variable Insurance Trust

MFS Variable Insurance Trust II

MFS Variable Insurance Trust III

MFS California Municipal Fund

MFS Charter Income Trust

MFS Government Markets Income Trust

MFS High Income Municipal Trust

MFS High Yield Municipal Trust

MFS InterMarket Income Trust I

MFS Intermediate High Income Fund

MFS Intermediate Income Trust

MFS Investment Grade Municipal Trust

MFS Multimarket Income Trust

MFS Municipal Income Trust

MFS Special Value Trust

 

(each a “Registrant”)

 

POWER OF ATTORNEY

 

The undersigned, being the President and Principal Executive Officer, and Treasurer and Principal Financial and Accounting Officer, respectively, of each of the above-mentioned Registrants, hereby severally constitutes and appoints Mark N. Polebaum, Susan S. Newton, Christopher R. Bohane, Thomas H. Connors, Brian E.

 



 

Langenfeld and Susan A. Pereira, and each of them singly, as true and lawful attorneys, with full power to them and each of them to sign for each of the undersigned, in the names of, and in the capacities indicated below, any Registration Statement and any and all amendments thereto and to file the same with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission for the purpose of registering the Registrant as a management investment company under the Investment Company Act of 1940 and/or the shares issued by the Registrant under the Securities Act of 1933 granting unto my said attorneys, and each of them, acting alone, full power and authority to do and perform each and every act and thing requisite or necessary or desirable to be done in the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys or any of them may lawfully do or cause to be done by virtue thereof.

 

IN WITNESS WHEREOF, the undersigned have hereunto set their hand on this 7th day of December, 2012.

 

 

JOHN M. CORCORAN

 

President (Principal Executive Officer)

John M. Corcoran

 

 

 

 

 

 

 

 

DAVID L. DILORENZO

 

Principal Financial and Accounting Officer

David L. DiLorenzo

 

 

 



 

MFS® SERIES TRUST XIII

 

MFS® DIVERSIFIED INCOME FUND

MFS® GLOBAL REAL ESTATE FUND

MFS® GOVERNMENT SECURITIES FUND

MFS® NEW DISCOVERY VALUE FUND

 

INDEX TO EXHIBITS

 

EXHIBIT NO.

 

DESCRIPTION OF EXHIBIT

 

PAGE NO.

 

 

 

 

 

101

 

Risk/return summary of each fund’s prospectus as an Interactive Data File using eXtensible Business reporting language (“XBRL”)

 

 

 


EX-101.INS 2 ck0000356349-20130627.xml XBRL INSTANCE DOCUMENT 0000356349 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:C000033358Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:C000033359Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:C000033360Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:C000068409Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:C000068410Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:C000068411Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:C000068412Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:C000117928Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member rr:AfterTaxesOnDistributionsMember ck0000356349:C000033358Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member rr:AfterTaxesOnDistributionsAndSalesMember ck0000356349:C000033358Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:index_Standard_Poors_500_Stock_IndexMember 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:index_Barclays_US_GovernmentMortgage_Bond_IndexMember 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:index_Barclays_US_HighYield_Corporate_Bond_2_Issuer_Capped_IndexMember 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:index_JPMorgan_Emerging_Markets_Bond_Index_GlobalMember 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:index_MSCI_US_REIT_Index_gross_divMember 2013-02-28 2013-02-28 0000356349 ck0000356349:S000012219Member ck0000356349:index_Russell_1000_Value_IndexMember 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member ck0000356349:C000074269Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member ck0000356349:C000074272Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member ck0000356349:C000117929Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member ck0000356349:C000074270Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member ck0000356349:C000074271Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member ck0000356349:C000074273Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member ck0000356349:C000074274Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member ck0000356349:C000074275Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member ck0000356349:C000074276Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member rr:AfterTaxesOnDistributionsMember ck0000356349:C000074269Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member rr:AfterTaxesOnDistributionsAndSalesMember ck0000356349:C000074269Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000024971Member ck0000356349:index_FTSE_EPRANAREIT_Developed_Real_Estate_IndexMember 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member ck0000356349:C000002006Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member ck0000356349:C000002007Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member ck0000356349:C000002008Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member ck0000356349:C000002012Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member ck0000356349:C000002013Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member ck0000356349:C000002015Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member ck0000356349:C000002017Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member ck0000356349:C000002018Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member ck0000356349:C000117927Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member rr:AfterTaxesOnDistributionsMember ck0000356349:C000002007Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member rr:AfterTaxesOnDistributionsAndSalesMember ck0000356349:C000002007Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000000693Member ck0000356349:index_Barclays_US_GovernmentMortgage_Bond_IndexMember 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member ck0000356349:C000100956Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member ck0000356349:C000100957Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member ck0000356349:C000100958Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member ck0000356349:C000100959Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member ck0000356349:C000100960Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member ck0000356349:C000100961Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member ck0000356349:C000100962Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member ck0000356349:C000100963Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member ck0000356349:C000117930Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member rr:AfterTaxesOnDistributionsMember ck0000356349:C000100956Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member rr:AfterTaxesOnDistributionsAndSalesMember ck0000356349:C000100956Member 2013-02-28 2013-02-28 0000356349 ck0000356349:S000032712Member ck0000356349:index_Russell_2000_Value_IndexMember 2013-02-28 2013-02-28 xbrli:pure iso4217:USD 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. 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. 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), such that "Total Annual Fund Operating Expenses" do not exceed 1.45% of the fund's average daily net assets annually for each of Class A and Class R3 shares, 2.20% of the fund's average daily net assets annually for each of Class B, Class C, and Class R1 shares, 1.20% of the fund's average daily net assets annually for each of Class I and Class R4 shares, 1.70% of the fund's average daily net assets annually for Class R2 shares, and 1.16% of the fund's average daily net assets annually for Class R5 shares. This written agreement will continue until modified by the fund's Board of Trustees, but such agreement will continue until at least June 30, 2015. MFS SERIES TRUST XIII 485BPOS false 0000356349 2013-02-28 2013-06-27 2013-06-28 2013-06-28 MFS Diversified Income Fund Summary of Key Information DIFAX DIFCX DIFIX DIFDX DIFEX DIFFX DIFGX DIFHX Portfolio Turnover <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; 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 &#8220;Annual Fund Operating Expenses&#8221; or in the &#8220;Example,&#8221; affect the fund&#8217;s performance.&#160; During the most recent fiscal year, the fund&#8217;s portfolio turnover rate was 64% of the average value of its portfolio.</font> </p> 0.64 Principal Risks <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The principal risks of investing in the fund are:</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Investment Selection and Allocation Risk:</font></b> <font size="2" style="font-size:10.0pt;">MFS&#8217; investment analysis, its selection of investments, and its assessment of the risk/return potential of asset classes 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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Interest Rate Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Credit Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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, and other conditions.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">Lower quality debt instruments (commonly referred to as &#8220;high yield securities&#8221; or &#8220;junk bonds&#8221;) can involve a substantially greater risk of default or can already be in default, and their values can decline significantly. Lower quality debt instruments are regarded as having predominantly speculative characteristics. Lower 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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Foreign and Emerging Markets Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Exposure to foreign markets, especially emerging markets, through issuers or currencies can involve additional risks relating to market, economic, industry, political, regulatory, geopolitical, and other conditions. These factors can make foreign investments, especially those in emerging markets, more volatile and less liquid than U.S. investments. In addition, foreign markets can react differently to these conditions than the U.S. market. Emerging markets can have less developed markets, greater custody and operational risk, less developed legal, regulatory, and accounting systems, and greater political, social, and economic instability than developed markets.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Currency Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;The value of foreign currencies relative to the U.S. dollar fluctuates in response to market, economic, industry, political, regulatory, geopolitical, and other conditions, and a decline in the value of a foreign currency versus the U.S. dollar reduces the value in U.S. dollars of investments denominated in that foreign currency.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Prepayment/Extension Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Instruments subject to prepayment and/or extension can reduce the potential for gain for the instrument&#8217;s holders if the instrument is prepaid and increase the potential for loss if the maturity of the instrument is extended.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Inflation-Adjusted Debt Instruments Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Municipal Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Stock Market/Company Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Stock markets are volatile and can decline significantly in response to issuer, market, economic, industry, political, regulatory, geopolitical, and other conditions, as well as to investor perceptions of these conditions. The price of an equity security can decrease significantly in response to these conditions, and these conditions can affect a single issuer or type of security, issuers within a broad market sector, industry or geographic region, or the market in general.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Value Company Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Real Estate-Related Investment Risk:</font></b> <font size="2" style="font-size:10.0pt;">The risks of investing in real estate-related securities include certain risks associated with the direct ownership of real estate and the real estate industry in general. These include risks related to general, regional and local economic conditions; fluctuations in interest rates and property tax rates; shifts in zoning laws, environmental regulations and other governmental action; cash flow dependency; increased operating expenses; lack of availability of mortgage funds; losses due to natural disasters; overbuilding; losses due to casualty or condemnation; changes in property values and rental rates; and other factors.&#160; The securities of smaller real estate-related issuers can be more volatile and less liquid than securities of larger issuers and their issuers can have more limited financial resources.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Derivatives Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Derivatives can be highly volatile and involve risks in addition to the risks of the underlying indicator(s)&#160;on which the derivative is based. Gains or losses from derivatives can be substantially greater than the derivatives&#8217; original cost.&#160; Derivatives can involve leverage.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Leveraging Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Leverage involves investment exposure in an amount exceeding the initial investment. Leverage can cause increased volatility by magnifying gains or losses.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Counterparty and Third Party Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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&#8217;s or third party&#8217;s ability to perform in accordance with the terms of the transaction.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Liquidity Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> 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. Fees and Expenses <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">This table describes the fees and expenses that you may pay when you buy and hold shares of the fund. Expenses have been adjusted to reflect the estimated expenses of investing in another MFS fund.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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 &#8220;Sales Charges and Waivers or Reductions&#8221; on page&#160;11 of the fund&#8217;s prospectus and &#8220;Waivers of Sales Charges&#8221; on page&#160;I-15 of the fund&#8217;s statement of additional information Part&#160;I.</font> </p> 0.0475 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0100 0.0100 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0065 0.0065 0.0065 0.0065 0.0065 0.0065 0.0065 0.0065 0.0025 0.0100 0.0000 0.0100 0.0050 0.0025 0.0000 0.0000 0.0018 0.0018 0.0018 0.0018 0.0018 0.0018 0.0018 0.0010 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0109 0.0184 0.0084 0.0184 0.0134 0.0109 0.0084 0.0076 ~ http://mfs.com/20130627/role/ScheduleShareholderFees20001 column dei_LegalEntityAxis compact ck0000356349_S000012219Member row primary compact * ~ ~ http://mfs.com/20130627/role/ScheduleAnnualFundOperatingExpenses20002 column dei_LegalEntityAxis compact ck0000356349_S000012219Member row primary compact * ~ 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. Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 50000 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. Shareholder Fees (fees paid directly from your investment) Performance Information <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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&#8217;s performance over time and how the fund&#8217;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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund&#8217;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 <b>mfs.com</b> or by calling 1-800-225-2606.</font> </p> Class A Bar Chart. 0.0079 -0.2041 0.3026 0.1392 0.0513 0.1319 ~ http://mfs.com/20130627/role/ScheduleAnnualTotalReturnsBarChart20005 column dei_LegalEntityAxis compact ck0000356349_S000012219Member column rr_ProspectusShareClassAxis compact ck0000356349_C000033358Member row primary compact * ~ <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt;">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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-family: Times New Roman;"/> </p> highest quarterly return 0.1583 2009-09-30 lowest quarterly return -0.1517 2008-12-31 The total return for the three-month period 0.0404 2013-03-31 <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The total return for the three-month period ended March&#160;31, 2013 was 4.04%. During the period(s)&#160;shown in the bar chart, the highest quarterly return was 15.83% (for the calendar quarter ended September&#160;30, 2009) and the lowest quarterly return was (15.17)% (for the calendar quarter ended December&#160;31, 2008).</font> </p> Performance Table. 0.1146 0.0628 0.0633 C Shares Returns Before Taxes 0.1347 0.0732 0.0739 I Shares Returns Before Taxes 0.1236 0.0629 0.0635 R1 Shares Returns Before Taxes 0.1302 0.0683 0.0689 R2 Shares Returns Before Taxes 0.1329 0.0710 0.0715 R3 Shares Returns Before Taxes 0.1347 0.0734 0.0740 R4 Shares Returns Before Taxes 0.1347 0.0732 0.0739 R5 Shares Returns Before Taxes 0.0781 0.0601 0.0631 A Shares Returns Before Taxes 0.0672 0.0453 0.0476 A Shares Returns After Taxes on Distributions 0.0521 0.0428 0.0451 A Shares Returns After Taxes on Distributions and Sale of Fund Shares 0.1600 0.0166 0.0394 Index Comparisons (Reflects no deduction for fees, expenses or taxes) Standard & Poor's 500 Stock Index 0.0227 0.0546 0.0605 Index Comparisons (Reflects no deduction for fees, expenses or taxes) Barclays U.S. Government/Mortgage Bond Index 0.1578 0.1045 0.0937 Index Comparisons (Reflects no deduction for fees, expenses or taxes) Barclays U.S. High-Yield Corporate Bond 2% Issuer Capped Index 0.1854 0.1047 0.1046 Index Comparisons (Reflects no deduction for fees, expenses or taxes) JPMorgan Emerging Markets Bond Index Global 0.1777 0.0558 0.0497 Index Comparisons (Reflects no deduction for fees, expenses or taxes) MSCI U.S. REIT Index (gross div) 0.1751 0.0059 0.0266 Index Comparisons (Reflects no deduction for fees, expenses or taxes) Russell 1000 Value Index 2006-05-26 2006-05-26 2006-05-26 2006-05-26 2006-05-26 2006-05-26 2006-05-26 2006-05-26 2006-05-26 2006-05-26 2006-05-26 2006-05-26 2006-05-26 2006-05-26 ~ http://mfs.com/20130627/role/ScheduleAverageAnnualReturnsTransposed20006 column dei_LegalEntityAxis compact ck0000356349_S000012219Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">Aft</font><font size="2" style="font-size:10.0pt;">er-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)&#160;plans or individual retirement accounts. The after-tax returns are shown for only one of the fund&#8217;s classes of shares, and after-tax returns for the fund&#8217;s other classes of shares will vary from the returns shown.</font> </p> 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. 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. 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. (Reflects no deduction for fees, expenses or taxes) 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. 1-800-225-2606 mfs.com 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. Average Annual Total Returns (for the Periods Ended December 31, 2012) Example <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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&#8217;s operating expenses remain the same.</font> </p> 581 805 1047 1741 287 579 996 2159 187 579 996 2159 86 268 466 1037 187 579 996 2159 136 425 734 1613 111 347 601 1329 86 268 466 1037 78 243 422 942 ~ http://mfs.com/20130627/role/ScheduleExpenseExampleTransposed20003 column dei_LegalEntityAxis compact ck0000356349_S000012219Member row primary compact * ~ ~ http://mfs.com/20130627/role/ScheduleExpenseExampleNoRedemptionTransposed20004 column dei_LegalEntityAxis compact ck0000356349_S000012219Member row primary compact * ~ Although your actual costs will likely be higher or lower, under these assumptions your costs would be: Principal Investment Strategies <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS (Massachusetts Financial Services Company, the fund&#8217;s investment adviser) normally invests the fund&#8217;s assets primarily in a broad range of debt instruments and equity securities of U.S. and foreign issuers, including convertible securities, real estate-related investments, and emerging market securities. MFS may invest the fund&#8217;s assets in other mutual funds advised by MFS that invest in such instruments and securities instead of investing directly in such instruments and securities.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS allocates the fund&#8217;s assets across these categories based on its interpretation of economic and money market conditions, fiscal and monetary policy and asset class and/or security values. These allocations may vary from time to time.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS focuses the fund&#8217;s debt investments on U.S. Government securities, less than investment grade quality debt instruments (lower quality debt instruments), and debt instruments of emerging market issuers. Of the fund&#8217;s investments in debt instruments, MFS may invest up to 100% of these investments directly or indirectly in lower quality debt instruments.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">For the equity portion of the fund, MFS focuses on investing the fund&#8217;s assets in dividend-paying stocks and/or in the stocks of companies it believes are undervalued compared to their perceived worth (value companies). While MFS may invest the equity portion of the fund&#8217;s assets in companies of any size, MFS generally focuses on companies with large capitalizations.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">For the real estate-related portion of the fund, MFS invests the fund&#8217;s assets in real estate investment trusts (REITs) and other companies principally engaged in the real estate industry. MFS generally focuses the fund&#8217;s investments in equity REITs, but may also invest in mortgage REITs and other real estate-related investments.&#160; Issuers of real estate-related investments tend to be small- to medium-sized.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">While 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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS uses a bottom-up investment approach to buying and selling investments for the fund. Investments are selected based on fundamental analysis of individual issuers and instruments and quantitative models that systematically evaluate issuers and instruments. In structuring the fund, MFS may also consider top-down factors.</font> </p> Investment Objective <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund&#8217;s investment objective is to seek total return with an emphasis on current income, but also considering capital appreciation.</font> </p> MFS Global Real Estate Fund Summary of Key Information MGLAX MGLIX MGLRX Portfolio Turnover <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; 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 &#8220;Annual Fund Operating Expenses&#8221; or in the &#8220;Example,&#8221; affect the fund&#8217;s performance.&#160; During the most recent fiscal year, the fund&#8217;s portfolio turnover rate was 46% of the average value of its portfolio.</font> </p> 0.46 Principal Risks <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The principal risks of investing in the fund are:</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Real Estate-Related Investment Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;The fund&#8217;s performance will be closely tied to the performance of real estate-related investments and as a result, can be more volatile than the performance of more broadly-diversified funds. The risks of investing in real estate-related investments include certain risks associated with the direct ownership of real estate and the real estate industry in general. These include risks related to general, regional and local economic conditions; fluctuations in interest rates and property tax rates; shifts in zoning laws, environmental regulations and other governmental action; cash flow dependency; increased operating expenses; lack of availability of mortgage funds; losses due to natural disasters; overbuilding; losses due to casualty or condemnation; changes in property values and rental rates; and other factors.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Small to Medium Cap Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;The securities of small and medium-sized real estate-related issuers can be more volatile and less liquid than securities of larger issuers and their issuers can have more limited financial resources.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Stock Market/Company Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Stock markets are volatile and can decline significantly in response to issuer, market, economic, industry, political, regulatory, geopolitical, and other conditions, as well as to investor perceptions of these conditions. The price of an equity security can decrease significantly in response to these conditions, and these conditions can affect a single issuer or type of security, issuers within a broad market sector, industry or geographic region, or the market in general.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Foreign and Emerging Markets Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Exposure to foreign markets, especially emerging markets, through issuers or currencies can involve additional risks relating to market, economic, industry, political, regulatory, geopolitical, and other conditions. These factors can make foreign investments, especially those in emerging markets, more volatile and less liquid than U.S. investments. In addition, foreign markets can react differently to these conditions than the U.S. market. Emerging markets can have less developed markets, greater custody and operational risk, less developed legal, regulatory, and accounting systems, and greater political, social, and economic instability than developed markets.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Currency Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;The value of foreign currencies relative to the U.S. dollar fluctuates in response to market, economic, industry, political, regulatory, geopolitical, and other conditions, and a decline in the value of a foreign currency versus the U.S. dollar reduces the value in U.S. dollars of investments denominated in that foreign currency.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Geographic Concentration Risk:</font></b> <font size="2" style="font-size:10.0pt;">The fund&#8217;s performance could be closely tied to the market, currency, economic, political, regulatory, geopolitical, and other conditions in the countries or regions in which the fund invests and could be more volatile than the performance of more geographically-diversified funds.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Investment Selection Risk:</font></b> <font size="2" style="font-size:10.0pt;">MFS&#8217; 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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Liquidity Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> 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. Fees and Expenses <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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, and Class R4 shares are based on estimated &#8220;Other Expenses&#8221; for the current fiscal year expressed as a percentage of the fund&#8217;s estimated average net assets during the period.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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 &#8220;Sales Charges and Waivers or Reductions&#8221; on page 8 of the fund&#8217;s prospectus and &#8220;Waivers of Sales Charges&#8221; on page I-13 of the fund&#8217;s statement of additional information Part I.</font> </p> 0.0575 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0100 0.0400 0.0100 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0090 0.0090 0.0090 0.0090 0.0090 0.0090 0.0090 0.0090 0.0090 0.0025 0.0100 0.0100 0.0000 0.0100 0.0050 0.0025 0.0000 0.0000 0.0008 0.0008 0.0008 0.0008 0.0008 0.0008 0.0008 0.0008 0.0008 0.0123 0.0198 0.0198 0.0098 0.0198 0.0148 0.0123 0.0098 0.0098 ~ http://mfs.com/20130627/role/ScheduleShareholderFees20009 column dei_LegalEntityAxis compact ck0000356349_S000024971Member row primary compact * ~ ~ http://mfs.com/20130627/role/ScheduleAnnualFundOperatingExpenses20010 column dei_LegalEntityAxis compact ck0000356349_S000024971Member row primary compact * ~ 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. Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 50000 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. Shareholder Fees (fees paid directly from your investment) Performance Information <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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&#8217;s performance over time and how the fund&#8217;s performance over time compares with that of a broad measure of market performance.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund&#8217;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 <b>mfs.com</b> or by calling 1-800-225-2606.</font> </p> Class A Bar Chart. 0.1529 -0.0722 0.2949 ~ http://mfs.com/20130627/role/ScheduleAnnualTotalReturnsBarChart20013 column dei_LegalEntityAxis compact ck0000356349_S000024971Member column rr_ProspectusShareClassAxis compact ck0000356349_C000074269Member row primary compact * ~ <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt;">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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-family: Times New Roman;"/> </p> highest quarterly return 0.1870 2010-09-30 lowest quarterly return -0.1805 2011-09-30 The total return for the three-month period 0.0559 2013-03-31 <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The total return for the three-month period ended March 31, 2013 was 5.59%. During the period(s) shown in the bar chart, the highest quarterly return was 18.70% (for the calendar quarter ended September 30, 2010) and the lowest quarterly return was (18.05)% (for the calendar quarter ended September 30, 2011).</font> </p> Performance Table. 0.2440 0.2850 B Shares Returns Before Taxes 0.2740 0.2889 C Shares Returns Before Taxes 0.2968 0.3018 I Shares Returns Before Taxes 0.2840 0.2889 R1 Shares Returns Before Taxes 0.2904 0.2953 R2 Shares Returns Before Taxes 0.2936 0.2985 R3 Shares Returns Before Taxes 0.2968 0.3018 R4 Shares Returns Before Taxes 0.2968 0.3018 R5 Shares Returns Before Taxes 0.2204 0.2787 A Shares Returns Before Taxes 0.1976 0.2205 A Shares Returns After Taxes on Distributions 0.1489 0.2104 A Shares Returns After Taxes on Distributions and Sale of Fund Shares 0.2865 0.3227 Index Comparison (Reflects no deduction for fees, expenses or taxes) FTSE EPRA/NAREIT Developed Real Estate Index 2009-03-11 2009-03-11 2009-03-11 2009-03-11 2009-03-11 2009-03-11 2009-03-11 2009-03-11 2009-03-11 2009-03-11 ~ http://mfs.com/20130627/role/ScheduleAverageAnnualReturnsTransposed20014 column dei_LegalEntityAxis compact ck0000356349_S000024971Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">Aft</font><font size="2" style="font-size:10.0pt;">er-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&#8217;s classes of shares, and after-tax returns for the fund&#8217;s other classes of shares will vary from the returns shown.</font> </p> 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. The bar chart and performance table below are intended to provide some indication of the risks of investing in the fund by showing changes in the fund's performance over time and how the fund's performance over time compares with that of a broad measure of market performance. The fund's past performance (before and after taxes) does not necessarily indicate how the fund will perform in the future. 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. (Reflects no deduction for fees, expenses or taxes) 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. 1-800-225-2606 mfs.com Average Annual Total Returns (for the Periods Ended December 31, 2012) 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. Example <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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&#8217;s operating expenses remain the same.</font> </p> 693 943 1212 1978 601 921 1268 2113 201 621 1068 2113 301 621 1068 2306 201 621 1068 2306 100 312 542 1201 201 621 1068 2306 151 468 808 1768 125 390 676 1489 100 312 542 1201 100 312 542 1201 ~ http://mfs.com/20130627/role/ScheduleExpenseExampleTransposed20011 column dei_LegalEntityAxis compact ck0000356349_S000024971Member row primary compact * ~ ~ http://mfs.com/20130627/role/ScheduleExpenseExampleNoRedemptionTransposed20012 column dei_LegalEntityAxis compact ck0000356349_S000024971Member row primary compact * ~ Although your actual costs will likely be higher or lower, under these assumptions your costs would be: Principal Investment Strategies <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS (Massachusetts Financial Services Company, the fund&#8217;s investment adviser) normally invests at least 80% of the fund&#8217;s net assets in U.S. and foreign real estate-related investments.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS normally invests the fund&#8217;s assets primarily in equity securities.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS generally focuses the fund&#8217;s investments in equity real estate investment trusts (&#8220;REITs&#8221;) as well as similar entities formed under the laws of non-U.S. countries, but may also invest in mortgage REITs, hybrid REITs and other U.S. and foreign real estate-related investments, including emerging market real estate-related investments.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS may invest the fund&#8217;s assets in real estate-related investments of any size.&#160; However, issuers of real estate-related investments tend to be small-to-medium-sized.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS typically allocates the fund&#8217;s investments across various geographic areas, REIT managers and property types, but may from time to time focus the fund&#8217;s investments in any one or a few of these areas.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS may invest a large percentage of the fund&#8217;s assets in issuers in a single country, a small number of countries, or a particular geographic region.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS selects investments by analyzing the fundamental and relative values of potential investments.</font> </p> MFS (Massachusetts Financial Services Company, the fund's investment adviser) normally invests at least 80% of the fund's net assets in U.S. and foreign real estate-related investments. Investment Objective <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund&#8217;s investment objective is to seek total return.</font> </p> MFS Government Securities Fund Summary of Key Information MGSIX MFGSX MFGJX MFGBX MFGDX MFGGX MGVSX MFGHX MFGKX Portfolio Turnover <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; 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 &#8220;Annual Fund Operating Expenses&#8221; or in the &#8220;Example,&#8221; affect the fund&#8217;s performance.&#160; During the most recent fiscal year, the fund&#8217;s portfolio turnover rate was 81% of the average value of its portfolio.</font> </p> 0.81 Principal Risks <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The principal risks of investing in the fund are:</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Interest Rate Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Credit Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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, and other conditions.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">U.S. Government securities not supported as to the payment of principal or interest by the U.S. Treasury are subject to greater credit risk than are U.S. Government securities supported by the U.S. Treasury.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Issuer Focus Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;The fund&#8217;s performance could be more volatile than the performance of more diversified funds.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Prepayment/Extension Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Instruments subject to prepayment and/or extension can reduce the potential for gain for the instrument&#8217;s holders if the instrument is prepaid and increase the potential for loss if the maturity of the instrument is extended.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Inflation-Adjusted Debt Instruments Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Derivatives Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Derivatives can be highly volatile and involve risks in addition to the risks of the underlying indicator(s)&#160;on which the derivative is based. Gains or losses from derivatives can be substantially greater than the derivatives&#8217; original cost.&#160; Derivatives can involve leverage.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Leveraging Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Leverage involves investment exposure in an amount exceeding the initial investment. Leverage can cause increased volatility by magnifying gains or losses.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Investment Selection Risk:</font></b> <font size="2" style="font-size:10.0pt;">MFS&#8217; 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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Counterparty and Third Party Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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&#8217;s or third party&#8217;s ability to perform in accordance with the terms of the transaction.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Liquidity Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> 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. Fees and Expenses <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">This table describes the fees and expenses that you may pay when you buy and hold shares of the fund. &#160;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 &#8220;Sales Charges and Waivers or Reductions&#8221; on page&#160;8 of the fund&#8217;s prospectus and &#8220;Waivers of Sales Charges&#8221; on page&#160;I-14 of the fund&#8217;s statement of additional information Part&#160;I.</font> </p> 0.0475 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0100 0.0400 0.0100 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0040 0.0040 0.0040 0.0040 0.0040 0.0040 0.0040 0.0040 0.0040 0.0025 0.0100 0.0100 0.0000 0.0100 0.0050 0.0025 0.0000 0.0000 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0010 0.0085 0.0160 0.0160 0.0060 0.0160 0.0110 0.0085 0.0060 0.0050 ~ http://mfs.com/20130627/role/ScheduleShareholderFees20017 column dei_LegalEntityAxis compact ck0000356349_S000000693Member row primary compact * ~ ~ http://mfs.com/20130627/role/ScheduleAnnualFundOperatingExpenses20018 column dei_LegalEntityAxis compact ck0000356349_S000000693Member row primary compact * ~ 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. Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 50000 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. Shareholder Fees (fees paid directly from your investment) Performance Information <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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&#8217;s performance over time and how the fund&#8217;s performance over time compares with that of a broad measure of market performance.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund&#8217;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 <b>mfs.com</b> or by calling 1-800-225-2606.</font> </p> Class A Bar Chart. 0.0154 0.0330 0.0217 0.0360 0.0707 0.0851 0.0423 0.0459 0.0719 0.0208 ~ http://mfs.com/20130627/role/ScheduleAnnualTotalReturnsBarChart20021 column dei_LegalEntityAxis compact ck0000356349_S000000693Member column rr_ProspectusShareClassAxis compact ck0000356349_C000002007Member row primary compact * ~ <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt;">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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="3" style="font-family: Times New Roman;"/> </p> highest quarterly return 0.0529 2008-12-31 lowest quarterly return -0.0223 2004-06-30 The total return for the three-month period -0.0030 2013-03-31 <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The total return for the three-month period ended March&#160;31, 2013 was (0.30)%. During the period(s)&#160;shown in the bar chart, the highest quarterly return was 5.29% (for the calendar quarter ended December&#160;31, 2008) and the lowest quarterly return was (2.23)% (for the calendar quarter ended June&#160;30, 2004).</font> </p> Performance Table. -0.0264 0.0418 0.0380 B Shares Returns Before Taxes 0.0033 0.0449 0.0363 C Shares Returns Before Taxes 0.0234 0.0556 0.0468 I Shares Returns Before Taxes 0.0132 0.0451 0.0355 R1 Shares Returns Before Taxes 0.0183 0.0504 0.0405 R2 Shares Returns Before Taxes 0.0208 0.0530 0.0433 R3 Shares Returns Before Taxes 0.0234 0.0556 0.0462 R4 Shares Returns Before Taxes 0.0227 0.0554 0.0468 R5 Shares Returns Before Taxes -0.0276 0.0428 0.0390 A Shares Returns Before Taxes -0.0371 0.0303 0.0251 A Shares Returns After Taxes on Distributions -0.0173 0.0292 0.0250 A Shares Returns After Taxes on Distributions and Sale of Fund Shares 0.0227 0.0546 0.0487 Index Comparison (Reflects no deduction for fees, expenses or taxes) Barclays U.S. Government/Mortgage Bond Index ~ http://mfs.com/20130627/role/ScheduleAverageAnnualReturnsTransposed20022 column dei_LegalEntityAxis compact ck0000356349_S000000693Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">Aft</font><font size="2" style="font-size:10.0pt;">er-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)&#160;plans or individual retirement accounts. The after-tax returns are shown for only one of the fund&#8217;s classes of shares, and after-tax returns for the fund&#8217;s other classes of shares will vary from the returns shown.</font> </p> 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. The bar chart and performance table below are intended to provide some indication of the risks of investing in the fund by showing changes in the fund's performance over time and how the fund's performance over time compares with that of a broad measure of market performance. The fund's past performance (before and after taxes) does not necessarily indicate how the fund will perform in the future. 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. (Reflects no deduction for fees, expenses or taxes) 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. 1-800-225-2606 mfs.com Average Annual Total Returns (for the Periods Ended December 31, 2012) 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. Example <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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&#8217;s operating expenses remain the same.</font> </p> 558 733 924 1474 563 805 1071 1699 163 505 871 1699 263 505 871 1900 163 505 871 1900 61 192 335 750 163 505 871 1900 112 350 606 1340 87 271 471 1049 61 192 335 750 51 160 280 628 ~ http://mfs.com/20130627/role/ScheduleExpenseExampleTransposed20019 column dei_LegalEntityAxis compact ck0000356349_S000000693Member row primary compact * ~ ~ http://mfs.com/20130627/role/ScheduleExpenseExampleNoRedemptionTransposed20020 column dei_LegalEntityAxis compact ck0000356349_S000000693Member row primary compact * ~ Although your actual costs will likely be higher or lower, under these assumptions your costs would be: Principal Investment Strategies <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS (Massachusetts Financial Services Company, the fund&#8217;s investment adviser) normally invests at least 80% of the fund&#8217;s net assets in U.S. Government securities.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS generally invests substantially all of the fund&#8217;s assets in investment grade debt instruments.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS may invest a relatively large percentage of the fund&#8217;s assets in a single issuer or a small number of issuers.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">While 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 exposure, or as alternatives to direct investments. Derivatives include futures, forward contracts, options, structured securities, inverse floating rate instruments, and swaps.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS uses a bottom-up investment approach to buying and selling investments for the fund. Investments are selected primarily based on fundamental analysis of individual instruments and their issuers. Quantitative models that systematically evaluate instruments may also be considered. In structuring the fund, MFS may also consider top-down factors.</font> </p> Investment Objective <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund&#8217;s investment objective is to seek total return with an emphasis on current income, but also considering capital appreciation.</font> </p> MFS New Discovery Value Fund Summary of Key Information NDVAX NDVBX NDVCX NDVIX NDVRX NDVSX NDVTX NDVUX NDVVX Portfolio Turnover <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; 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 &#8220;Annual Fund Operating Expenses&#8221; or in the &#8220;Example,&#8221; affect the fund&#8217;s performance.&#160; During the most recent fiscal year, the fund&#8217;s portfolio turnover rate was 67% of the average value of its portfolio.</font> </p> 0.67 Principal Risks <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The principal risks of investing in the fund are:</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Stock Market/Company Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Stock markets are volatile and can decline significantly in response to issuer, market, economic, industry, political, regulatory, geopolitical, and other conditions, as well as to investor perceptions of these conditions. The price of an equity security can decrease significantly in response to these conditions, and these conditions can affect a single issuer or type of security, issuers within a broad market sector, industry or geographic region, or the market in general.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Value Company Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Small Cap Risk:</font></b><font size="2" style="font-size:10.0pt;">&#160; The stocks of small cap companies can be more volatile than stocks of larger companies.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Foreign Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;Exposure to foreign markets through issuers or currencies can involve additional risks relating to market, economic, industry, political, regulatory, geopolitical, and other conditions. These factors can make foreign investments, especially those in emerging markets, more volatile and less liquid than U.S. investments. In addition, foreign markets can react differently to these conditions than the U.S. market.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Real Estate Investment Trust Risk:</font></b> <font size="2" style="font-size:10.0pt;">The risks of investing in REITs include certain risks associated with the direct ownership of real estate and the real estate industry in general. These include risks related to general, regional and local economic conditions; fluctuations in interest rates and property tax rates; shifts in zoning laws, environmental regulations and other governmental action; cash flow dependency; increased operating expenses; lack of availability of mortgage funds; losses due to natural disasters; overbuilding; losses due to casualty or condemnation; changes in property values and rental rates; and other factors.&#160; The securities of smaller real estate-related issuers can be more volatile and less liquid than securities of larger issuers and their issuers can have more limited financial resources.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Investment Selection Risk:</font></b> <font size="2" style="font-size:10.0pt;">MFS&#8217; 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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <b><font size="2" style="font-size:10.0pt;font-weight:bold; font-family: Times New Roman;">Liquidity Risk:</font></b> <font size="2" style="font-size:10.0pt;">&#160;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.</font> </p> 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. Fees and Expenses <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">This table describes the fees and expenses that you may pay when you buy and hold shares of the fund. Expenses have been adjusted to reflect current fee arrangements.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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 &#8220;Sales Charges and Waivers or Reductions&#8221; on page&#160;7 of the fund&#8217;s prospectus and &#8220;Waivers of Sales Charges&#8221; on page&#160;I-15 of the fund&#8217;s statement of additional information Part&#160;I.</font> </p> 0.0575 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0100 0.0400 0.0100 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0090 0.0090 0.0090 0.0090 0.0090 0.0090 0.0090 0.0090 0.0090 0.0025 0.0100 0.0100 0.0000 0.0100 0.0050 0.0025 0.0000 0.0000 0.0047 0.0047 0.0047 0.0047 0.0047 0.0047 0.0047 0.0047 0.0041 0.0162 0.0237 0.0237 0.0137 0.0237 0.0187 0.0162 0.0137 0.0131 -0.0017 -0.0017 -0.0017 -0.0017 -0.0017 -0.0017 -0.0017 -0.0017 -0.0015 0.0145 0.0220 0.0220 0.0120 0.0220 0.0170 0.0145 0.0120 0.0116 ~ http://mfs.com/20130627/role/ScheduleShareholderFees20025 column dei_LegalEntityAxis compact ck0000356349_S000032712Member row primary compact * ~ ~ http://mfs.com/20130627/role/ScheduleAnnualFundOperatingExpenses20026 column dei_LegalEntityAxis compact ck0000356349_S000032712Member row primary compact * ~ 2015-06-30 Expenses have been adjusted to reflect current fee arrangements. 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. Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 50000 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. Shareholder Fees (fees paid directly from your investment) Performance Information <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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&#8217;s performance over time compares with that of a broad measure of market performance.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund&#8217;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 <b>mfs.com</b> or by calling 1-800-225-2606.</font> </p> Class A Bar Chart. 0.2015 ~ http://mfs.com/20130627/role/ScheduleAnnualTotalReturnsBarChart20029 column dei_LegalEntityAxis compact ck0000356349_S000032712Member column rr_ProspectusShareClassAxis compact ck0000356349_C000100956Member row primary compact * ~ <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt;">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.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-family: Times New Roman;"/> </p> highest quarterly return 0.1486 2012-03-31 lowest quarterly return -0.0276 2012-06-30 The total return for the three-month period 0.1270 2013-03-31 <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The total return for the three-month period ended March&#160;31, 2013 was 12.70%. During the period(s)&#160;shown in the bar chart, the highest quarterly return was 14.86% (for the calendar quarter ended March&#160;31, 2012) and the lowest quarterly return was (2.76)% (for the calendar quarter ended June&#160;30, 2012).</font> </p> Performance Table. 0.1519 0.0367 B Shares Returns Before Taxes 0.1829 0.0611 C Shares Returns Before Taxes 0.2049 0.0717 I Shares Returns Before Taxes 0.1921 0.0611 R1 Shares Returns Before Taxes 0.1994 0.0666 R2 Shares Returns Before Taxes 0.2021 0.0691 R3 Shares Returns Before Taxes 0.2049 0.0717 R4 Shares Returns Before Taxes 0.2051 0.0718 R5 Shares Returns Before Taxes 0.1324 0.0305 A Shares Returns Before Taxes 0.1105 0.0176 A Shares Returns After Taxes on Distributions 0.0880 0.0192 A Shares Returns After Taxes on Distributions and Sale of Fund Shares 0.1805 0.0512 Index Comparison (Reflects no deduction for fees, expenses or taxes) Russell 2000 Value Index 2011-05-26 2011-05-26 2011-05-26 2011-05-26 2011-05-26 2011-05-26 2011-05-26 2011-05-26 2011-05-26 2011-05-26 ~ http://mfs.com/20130627/role/ScheduleAverageAnnualReturnsTransposed20030 column dei_LegalEntityAxis compact ck0000356349_S000032712Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">Aft</font><font size="2" style="font-size:10.0pt;">er-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)&#160;plans or individual retirement accounts. The after-tax returns are shown for only one of the fund&#8217;s classes of shares, and after-tax returns for the fund&#8217;s other classes of shares will vary from the returns shown.</font> </p> 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. 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. 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. (Reflects no deduction for fees, expenses or taxes) 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. 1-800-225-2606 mfs.com Average Annual Total Returns (for the Periods Ended December 31, 2012) 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. Example <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">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&#8217;s operating expenses remain the same.</font> </p> 714 1025 1375 2359 623 1006 1434 2492 223 706 1234 2492 323 706 1234 2679 223 706 1234 2679 122 400 717 1616 223 706 1234 2679 173 554 979 2162 148 477 848 1892 122 400 717 1616 118 385 689 1552 ~ http://mfs.com/20130627/role/ScheduleExpenseExampleTransposed20027 column dei_LegalEntityAxis compact ck0000356349_S000032712Member row primary compact * ~ ~ http://mfs.com/20130627/role/ScheduleExpenseExampleNoRedemptionTransposed20028 column dei_LegalEntityAxis compact ck0000356349_S000032712Member row primary compact * ~ Although your actual costs will likely be higher or lower, under these assumptions your costs would be: Principal Investment Strategies <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS (Massachusetts Financial Services Company, the fund&#8217;s investment adviser) normally invests the fund&#8217;s assets primarily in equity securities. Equity securities include common stocks, preferred stocks, securities convertible into stocks, equity interests in real estate investment trusts (REITs), and depositary receipts for such securities.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS focuses on investing the fund&#8217;s assets in the stocks of companies it believes are undervalued compared to their perceived worth (value companies).</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">While MFS may invest the fund&#8217;s assets in companies of any size, MFS generally focuses on companies with small capitalizations.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS may invest the fund&#8217;s assets in foreign securities.</font> </p> <br/><p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">MFS uses a bottom-up investment approach to buying and selling investments for the fund. Investments are selected primarily based on fundamental analysis of individual issuers. Quantitative models that systematically evaluate issuers may also be considered.</font> </p> Investment Objective <p style="margin:0in 0in .0001pt;"> <font size="2" style="font-size:10.0pt; font-family: Times New Roman;">The fund&#8217;s investment objective is to seek capital appreciation.</font> </p> EX-101.SCH 3 ck0000356349-20130627.xsd XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT 000001 - Document - Document and Entity Information link:presentationLink link:definitionLink link:calculationLink 020000 - Document - Risk/Return Summary {Unlabeled} - MFS Diversified Income Fund link:presentationLink link:definitionLink link:calculationLink 020001 - Schedule - Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 020002 - Schedule - Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 020003 - Schedule - Expense Example {Transposed} link:presentationLink link:definitionLink link:calculationLink 020004 - Schedule - Expense Example No Redemption {Transposed} link:presentationLink link:definitionLink link:calculationLink 020005 - Schedule - Annual Total Returns [Bar Chart] link:presentationLink link:definitionLink link:calculationLink 020006 - Schedule - Average Annual Returns {Transposed} link:presentationLink link:definitionLink link:calculationLink 020008 - Document - Risk/Return Summary {Unlabeled} - MFS Global Real Estate Fund link:presentationLink link:definitionLink link:calculationLink 020009 - Schedule - Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 020010 - Schedule - Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 020011 - Schedule - Expense Example {Transposed} link:presentationLink link:definitionLink link:calculationLink 020012 - Schedule - Expense Example No Redemption {Transposed} link:presentationLink link:definitionLink link:calculationLink 020013 - Schedule - Annual Total Returns [Bar Chart] link:presentationLink link:definitionLink link:calculationLink 020014 - Schedule - Average Annual Returns {Transposed} link:presentationLink link:definitionLink link:calculationLink 020016 - Document - Risk/Return Summary {Unlabeled} - MFS Government Securities Fund link:presentationLink link:definitionLink link:calculationLink 020017 - Schedule - Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 020018 - Schedule - Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 020019 - Schedule - Expense Example {Transposed} link:presentationLink link:definitionLink link:calculationLink 020020 - Schedule - Expense Example No Redemption {Transposed} link:presentationLink link:definitionLink link:calculationLink 020021 - Schedule - Annual Total Returns [Bar Chart] link:presentationLink link:definitionLink link:calculationLink 020022 - Schedule - Average Annual Returns {Transposed} link:presentationLink link:definitionLink link:calculationLink 020024 - Document - Risk/Return Summary {Unlabeled} - MFS New Discovery Value Fund link:presentationLink link:definitionLink link:calculationLink 020025 - Schedule - Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 020026 - Schedule - Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 020027 - Schedule - Expense Example {Transposed} link:presentationLink link:definitionLink link:calculationLink 020028 - Schedule - Expense Example No Redemption {Transposed} link:presentationLink link:definitionLink link:calculationLink 020029 - Schedule - Annual Total Returns [Bar Chart] link:presentationLink link:definitionLink link:calculationLink 020030 - Schedule - Average Annual Returns {Transposed} link:presentationLink link:definitionLink link:calculationLink 020007 - Disclosure - Risk/Return Detail Data {Elements} - MFS Diversified Income Fund link:presentationLink link:definitionLink link:calculationLink 020015 - Disclosure - Risk/Return Detail Data {Elements} - MFS Global Real Estate Fund link:presentationLink link:definitionLink link:calculationLink 020023 - Disclosure - Risk/Return Detail Data {Elements} - MFS Government Securities Fund link:presentationLink link:definitionLink link:calculationLink 020031 - Disclosure - Risk/Return Detail Data {Elements} - MFS New Discovery Value Fund link:presentationLink link:definitionLink link:calculationLink EX-101.LAB 4 ck0000356349-20130627_lab.xml XBRL TAXONOMY EXTENSION LABELS LINKBASE DOCUMENT EX-101.DEF 5 ck0000356349-20130627_def.xml XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT