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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate May 01, 2011
SERIES J (Prospectus Summary): | SERIES J
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Series J (Mid Cap Growth Series)  
Supplement Text ck0000217087_SupplementTextBlock

SBL Fund

One Security Benefit Place

Topeka, Kansas 66636-0001

 

Supplement Dated July 14, 2011

to the Prospectus Dated May 1, 2011

 

Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading The Lowest Quarter Return in the Performance Information section of the Summary for Series J is removed and replaced with the following:
Bar Chart, Closing rr_BarChartClosingTextBlock

Lowest Quarter Return

 4Q 2008                      -28.87%

 

Please Retain This Supplement For Future Reference

 

SERIES J | A
 
Risk/Return: rr_RiskReturnAbstract  
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (28.87%)