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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Aug. 01, 2012
Inverse NASDAQ-100 Strategy Fund (Prospectus Summary): | Inverse NASDAQ-100 Strategy Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Inverse NASDAQ-100 ® Strategy Fund  
Supplement Text ck0000899148_SupplementTextBlock

RYDEX SERIES FUNDS

Inverse NASDAQ-100 ® Strategy Fund

Supplement dated September 13, 2012

to the Investor Class, Advisor Class and H-Class Shares Statutory Prospectus

and the A-Class Shares, C-Class Shares and Institutional Class Shares Statutory Prospectus

of the above listed Funds, each dated August 1, 2012

This supplement provides new and additional information beyond that contained in the Statutory Prospectuses (the “Prospectuses”) listed above and should be read in conjunction with the Prospectuses.

Inverse NASDAQ-100 ® Strategy Fund

 

 

•

 

Effective immediately, the “Since Inception (8/1/2003)” sub-heading under the “Average Annual Total Return—Investor Class Shares” headings is deleted and replaced with the sub-heading “Past 10 Years.” All of the return information currently presented under the “Since Inception (8/1/2003)” sub-heading correctly represents the Investor Class Shares’ return information for the past ten years and, thus, no change to the return information is required. For ease of reference, the average annual total return information for Investor Class Shares with the correct sub-headings is included below.

 
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading AVERAGE ANNUAL TOTAL RETURN (for periods ended December 31, 2011)  
Performance Table, Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table, Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table, Narrative rr_PerformanceTableNarrativeTextBlock

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

 
Supplement Closing ck0000899148_SupplementClosingTextBlock

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.

 

 
Inverse NASDAQ-100 Strategy Fund | Investor
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol RYAIX
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (9.83%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (10.96%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 (8.24%)
Inverse NASDAQ-100 Strategy Fund | Investor | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (9.83%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (11.27%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 (8.63%)
Inverse NASDAQ-100 Strategy Fund | Investor | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (6.39%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (9.05%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 (6.61%)
Inverse NASDAQ-100 Strategy Fund | Investor | NASDAQ-100 ® Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel NASDAQ-100 ® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.66%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.05%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.25%