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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate May 01, 2011
SERIES X (Prospectus Summary): | SERIES X
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Series X (Small 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 Highest Quarter Return in the Performance Information section of the Summary for Series X is removed and replaced with the following:
Bar Chart, Closing rr_BarChartClosingTextBlock

Highest Quarter Return

 1Q 2000                      29.18%

 

 

 

Please Retain This Supplement For Future Reference

 

 

 

SERIES X | A
 
Risk/Return: rr_RiskReturnAbstract  
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2000
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 29.18%