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It is commonly abbreviated as CIK.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 falsefalseCentral Index Key7false0dei_AmendmentFlagdeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalsefalseOtherxbrli:booleanItemTypenaIf the value is true, then the document as an amendment to previously-filed/accepted document.No authoritative reference available.falsefalseAmendment Flag8false0dei_DocumentCreationDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-02-28falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date the document was made available and submitted, in CCYY-MM-DD format. 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3/1/2011 eol_0000891804-11-001067_STD_1_20110301_0_396770x-9993759_396840x-9993740_429423x-9993778http://www.sec.gov/CIK0001208211duration2011-03-01T00:00:002011-03-01T00:00:00falsefalseRydex S&P SmallCap 600 Pure Value ETF (Prospectus Summary)dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldick0001208211_SummaryS000010943Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseRydex S&P SmallCap 600 Pure Value ETFdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0001208211_S000010943Memberdei_LegalEntityAxisexplicitMemberfalsefalseRydex S&P SmallCap 600 Pure Value ETF-Rydex S&P SmallCap 600 Pure Value ETFrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0001208211_C000030298Memberrr_ProspectusShareClassAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepure0OthernaNo definition available.No authoritative reference available.falsefalseRydex S&P SmallCap 600 Pure Value ETF (Prospectus Summary) | Rydex S&P SmallCap 600 Pure Value ETF | Rydex S&P SmallCap 600 Pure Value ETF-Rydex S&P SmallCap 600 Pure Value ETF29true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseRisk/Return:30false0dei_TradingSymboldeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00RZVfalsefalsefalsefalsefalseOtherxbrli:normalizedStringItemTypenormalizedstringTrading symbol of an instrument as listed on an exchange.No authoritative reference available.falsefalseTrading Symbol31false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.rydex-sgi.com/role/documentdocumentandentityinformation1falsefalsefalse00falsefalsefalsefalsefalse9falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : SummaryS000010944 Member {dei_LegalEntityAxis} : S000010944 Member {rr_ProspectusShareClassAxis} : C000030299 Member 3/1/2011 - 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