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Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Sep. 28, 2010
MFS Moderate Allocation Fund (Prospectus Summary): | MFS Moderate Allocation Fund
  
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Risk/Return, Heading rr_RiskReturnHeading MFS® Moderate Allocation Fund
Supplement Text ck0000783740_SupplementTextBlock

 

 

SUPPLEMENT TO PROSPECTUS

The date of this supplement is August 26, 2011.

 

 

MFS® Asset Allocation Funds

MFS® Conservative Allocation Fund,

MFS® Moderate Allocation Fund,

MFS® Growth Allocation Fund, and

MFS® Aggressive Growth Allocation Fund

 
Investment Strategy, Heading rr_StrategyHeading Effective immediately, the following replaces the second paragraph of the sub-section entitled "Principal Investment Strategies" beneath the main heading "Summary of Key Information" for MFS Moderate Allocation Fund:  
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock

As of August 26, 2011, the fund’s target allocation among asset classes and the underlying funds was:

 

Bond Funds:

40%

MFS Emerging Markets Debt Fund

3%

MFS Global Bond Fund

5%

MFS Government Securities Fund

10%

MFS High Income Fund

5%

MFS Inflation-Adjusted Bond Fund

5%

MFS Research Bond Fund

12%

Specialty Funds:

6%

MFS Absolute Return Fund

1%

MFS Commodity Strategy Fund

3%

MFS Global Real Estate Fund

2%

International Stock Funds:

13%

MFS International Growth Fund

3%

MFS International New Discovery Fund

1%

MFS International Value Fund

3%

MFS Research International Fund

6%

U.S. Stock Funds:

41%

MFS Growth Fund

8%

MFS Mid Cap Growth Fund

7%

MFS Mid Cap Value Fund

7%

MFS New Discovery Fund

1.5%

MFS New Discovery Value Fund

1.5%

MFS Research Fund

8%

MFS Value Fund

8%

 

 
MFS Moderate Allocation Fund | A
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MAMAX
MFS Moderate Allocation Fund | R4
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MAMJX
MFS Moderate Allocation Fund | 529A
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EAMDX
MFS Moderate Allocation Fund | 529B
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EBMDX
MFS Moderate Allocation Fund | 529C
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol ECMAX
MFS Moderate Allocation Fund | B
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MMABX
MFS Moderate Allocation Fund | C
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MMACX
MFS Moderate Allocation Fund | I
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MMAIX
MFS Moderate Allocation Fund | R1
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MAMFX
MFS Moderate Allocation Fund | R2
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MARRX
MFS Moderate Allocation Fund | R3
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MAMHX