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Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Mar. 01, 2011
Alger Capital Appreciation Fund (Supplement): | Alger Capital Appreciation Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Alger Capital Appreciation Fund  
Supplement Text ck0000003521_SupplementTextBlock

THE ALGER FUNDS

Alger Capital Appreciation Fund

Supplement Dated January 1, 2012 to the
Prospectus Dated March 1, 2011
As supplemented to date

 

 
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading The following is added to page 4, as the fourth sentence under the heading "Performance."  
Performance, Narrative rr_PerformanceNarrativeTextBlock

Prior to January 1, 2012, the Fund compared its performance to the Russell 3000 Growth Index. The Fund will compare its performance to the Russell 1000 Growth Index to better reflect the aggregate capitalization range of the securities in the Fund's portfolio.

 
Alger Capital Appreciation Fund | Alger Capital Appreciation Fund Class A
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol ACAAX
Alger Capital Appreciation Fund | Alger Capital Appreciation Fund Class B
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol ACAPX
Alger Capital Appreciation Fund | Alger Capital Appreciation Fund Class C
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol ALCCX