2.2.0.25truefalse0011 - Document - Document And Entity Information {Elements}truetruefalse1falsefalsefalsefalse4/1/2011 - 4/1/2011 eol_0000804887-11-000004_STD_1_20110401_0http://www.sec.gov/CIK0000804887duration2011-04-01T00:00:002011-04-01T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure02true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseRisk/Return:3false0dei_DocumentTypedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00485BPOSfalsefalsefalsefalsefalseOtherus-types:SECReportItemTypenaThe type of document being provided (such as 10-K, 10-Q, N-1A, etc). The document type should be limited to the same value as the supporting SEC submission type. The acceptable values are as follows: S-1, S-3, S-4, S-11, F-1, F-3, F-4, F-9, F-10, 6-K, 8-K, 10, 10-K, 10-Q, 20-F, 40-F, N-1A, 485BPOS, NCSR, N-Q, and Other.No authoritative reference available.falsefalseDocument Type4false0dei_DocumentPeriodEndDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002010-11-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements this will be the filing date. The format of the date is CCYY-MM-DD.No authoritative reference available.falsefalseDocument Period End Date5false0dei_EntityRegistrantNamedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00DREYFUS SHORT INTERMEDIATE GOVERNMENT FUNDfalsefalsefalsefalsefalseOtherxbrli:normalizedStringItemTypenormalizedstringThe exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 falsefalseRegistrant Name6false0dei_EntityCentralIndexKeydeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse000000804887falsefalsefalsefalsefalseOtherus-types:centralIndexKeyItemTypenaA unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. 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.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-03-30falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date the document was made available and submitted, in CCYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different.No authoritative reference available.falsefalseDocument Creation Date9false0dei_DocumentEffectiveDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-04-01falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date when a document, upon receipt and acceptance, becomes officially effective, in CCYY-MM-DD format. Usually it is a system-assigned date time value, but it may be declared by the submitter in some cases.No authoritative reference available.falsefalseDocument Effective Date10false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.dreyfus.com/role/documentdocumentandentityinformation1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : SummaryS000000097 Member {dei_LegalEntityAxis} : S000000097 Member {rr_ProspectusShareClassAxis} : C000000160 Member 4/1/2011 - 4/1/2011 eol_0000804887-11-000004_STD_1_20110401_0_396770x-9993174_396840x-9993173_429423x-9993175http://www.sec.gov/CIK0000804887duration2011-04-01T00:00:002011-04-01T00:00:00falsefalseDREYFUS SHORT INTERMEDIATE GOVERNMENT FUND (Prospectus Summary)dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldick0000804887_SummaryS000000097Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseDREYFUS SHORT INTERMEDIATE GOVERNMENT FUNDdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000804887_S000000097Memberdei_LegalEntityAxisexplicitMemberfalsefalseDREYFUS SHORT INTERMEDIATE GOVERNMENT FUNDrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000804887_C000000160Memberrr_ProspectusShareClassAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepure0OthernaNo definition available.No authoritative reference available.falsefalseDREYFUS SHORT INTERMEDIATE GOVERNMENT FUND (Prospectus Summary) | DREYFUS SHORT INTERMEDIATE GOVERNMENT FUND | DREYFUS SHORT INTERMEDIATE GOVERNMENT FUND11true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseRisk/Return:12false0dei_TradingSymboldeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00DSIGXfalsefalsefalsefalsefalseOtherxbrli:normalizedStringItemTypenormalizedstringTrading symbol of an instrument as listed on an exchange.No authoritative reference available.falsefalseTrading Symbol111Document And Entity InformationUnKnownUnKnownUnKnownUnKnownfalsetrue