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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Aug. 01, 2011
Precious Metals Fund (Prospectus Summary): | Precious Metals Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Precious Metals Fund  
Supplement Text ck0000899148_SupplementTextBlock

RYDEX SERIES FUNDS

Inverse NASDAQ-100® Strategy Fund
Precious Metals Fund
All-Asset Conservative Strategy Fund

Supplement dated September 9, 2011
to the Prospectuses dated August 1, 2011

This supplement provides new and additional information beyond that contained in the currently effective Prospectuses for the Funds listed above and should be read in conjunction with the Prospectuses.

 

 •

 

Effectively immediately, the information currently disclosed for Investor Class Shares of the Inverse NASDAQ-100® Strategy Fund, Advisor Class Shares of the Precious Metals Fund, and A-Class Shares of the All-Asset Conservative Strategy Fund under the heading “Average Annual Total Return” in each Fund’s “Fund Summary” section is replaced in its entirety with the information set forth below.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.

 
Performance Table, Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURN (for periods ended December 31, 2010)  
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.

 
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses or taxes
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.
Precious Metals Fund | Advisor | 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 37.69%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.20%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 14.28%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 01, 2003
Precious Metals Fund | Advisor | 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 24.51%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.59%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 12.77%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 01, 2003
Precious Metals Fund | Advisor
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol RYMPX
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 37.71%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.22%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 14.29%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 01, 2003
Precious Metals Fund | S&P500® Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel S&P500® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.06%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.29%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.52%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 01, 2003