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Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Sep. 28, 2010
MFS Aggressive Growth Allocation Fund (Prospectus Summary): | MFS Aggressive Growth Allocation Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading MFS® Aggressive Growth 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 Aggressive Growth 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:

0%

Specialty Funds:

10%

MFS Commodity Strategy Fund

5%

MFS Global Real Estate Fund

5%

International Stock Funds:

30%

MFS Emerging Markets Equity Fund

2%

MFS International Growth Fund

8%

MFS International New Discovery Fund

4%

MFS International Value Fund

8%

MFS Research International Fund

8%

U.S. Stock Funds:

60%

MFS Growth Fund

13%

MFS Mid Cap Growth Fund

10%

MFS Mid Cap Value Fund

10%

MFS New Discovery Fund

2.5%

MFS New Discovery Value Fund

2.5%

MFS Research Fund

9%

MFS Value Fund

13%

 

 
MFS Aggressive Growth Allocation Fund | A
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MAAGX
MFS Aggressive Growth Allocation Fund | R4
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MAALX
MFS Aggressive Growth Allocation Fund | 529A
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EAGTX
MFS Aggressive Growth Allocation Fund | 529B
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EBAAX
MFS Aggressive Growth Allocation Fund | 529C
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol ECAAX
MFS Aggressive Growth Allocation Fund | B
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MBAGX
MFS Aggressive Growth Allocation Fund | C
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MCAGX
MFS Aggressive Growth Allocation Fund | I
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MIAGX
MFS Aggressive Growth Allocation Fund | R1
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MAAFX
MFS Aggressive Growth Allocation Fund | R2
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MAWAX
MFS Aggressive Growth Allocation Fund | R3
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MAAHX