0000356349
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
ck0000356349:C000074272Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
ck0000356349:C000117929Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
ck0000356349:C000074269Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
ck0000356349:C000074270Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
ck0000356349:C000074271Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
ck0000356349:C000074273Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
ck0000356349:C000074274Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
ck0000356349:C000074275Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
ck0000356349:C000074276Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
rr:AfterTaxesOnDistributionsMember
ck0000356349:C000074269Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
rr:AfterTaxesOnDistributionsAndSalesMember
ck0000356349:C000074269Member
2013-03-27
2013-03-27
0000356349
ck0000356349:S000024971_1Member
ck0000356349:S000024971Member
ck0000356349:index_FTSE_EPRANAREIT_Developed_Real_Estate_IndexMember
2013-03-27
2013-03-27
xbrli:pure
MFS SERIES TRUST XIII
Other
false
0000356349
2013-03-27
2013-03-27
2013-03-27
2012-06-28
MFS® Global Real Estate Fund
MGLIX
MGLRX
MGLAX
Performance Table.
-0.1132
0.2839
B Shares Returns Before Taxes
-0.0869
0.2907
C Shares Returns Before Taxes
-0.0689
0.3035
I Shares Returns Before Taxes
-0.0781
0.2907
R1 Shares Returns Before Taxes
-0.0735
0.2971
R2 Shares Returns Before Taxes
-0.0712
0.3003
R3 Shares Returns Before Taxes
-0.0689
0.3035
R4 Shares Returns Before Taxes
-0.0689
0.3035
R5 Shares Returns Before Taxes
-0.1255
0.2730
A Shares Returns Before Taxes
-0.1361
0.2031
A Shares Returns After Taxes on Distributions
-0.0746
0.1997
A Shares Returns After Taxes on Distributions and Sale of Fund Shares
-0.0582
0.3350
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/20130327/role/ScheduleAverageAnnualReturnsTransposed20001 column dei_DocumentInformationDocumentAxis compact ck0000356349_S000024971_1Member column dei_LegalEntityAxis compact ck0000356349_S000024971Member column rr_PerformanceMeasureAxis compact * row primary compact * ~
<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"> <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your own tax situation, and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. The after-tax returns are shown for only one of the fund’s classes of shares, and after-tax returns for the fund’s other classes of shares will vary from the returns shown.</font> </div>
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 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)
Average Annual Total Returns (for the Periods Ended December 31, 2011)
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.
<div style="display: block; margin-left: 0pt; text-indent: 0pt; margin-right: 0pt;" align="left"> <font style="font-family: times new roman,times; font-size: medium;"><font style="display: inline;">SUPPLEMENT TO PROSPECTUS</font><font style="display: inline; font-weight: bold;"><br /> </font></font> </div> <br/><div style="display: block; margin-left: 0pt; text-indent: 0pt; margin-right: 0pt;" align="left"> <font style="display: inline; font-size: 10pt; font-family: times new roman,times;"><font style="font-size: medium;"><em>The date of this supplement is March 27, 2013.</em></font><br /> </font> </div> <br/><div style="display: block; margin-left: 0pt; text-indent: 0pt; margin-right: 0pt;" align="left"> <font style="display: inline; font-size: 10pt; font-family: Times New Roman;"><font><font style="font-family: times new roman,times; font-size: xx-large; color: #000000;">MFS<sup>®</sup> Global Real Estate Fund</font><br /> </font></font> </div> <br/><div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"> <font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Effective immediately, the sub-section entitled "Performance Table" within the sub-heading entitled “Performance Information” beneath the main heading "Summary of Key Information" is restated in its entirety as follows:</font> </div>