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Partnership Organization - Additional Information (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014
Limited Partners' Capital Account [Line Items] |  |  |
Percentage of limited partner interest | 99.43%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest |  |
Percentage of general partner interest | 0.57%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest |  |
8.875% Senior Notes |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Outstanding senior notes | 125 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = sgu_EightPointEightSevenFivePercentSeniorNotesMember |  |
Interest on senior notes | 8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = sgu_EightPointEightSevenFivePercentSeniorNotesMember | 8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = sgu_EightPointEightSevenFivePercentSeniorNotesMember |
Maturity of public notes due | Dec. 01, 2017 |  |
Star Acquisitions, Inc |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Ownership interest of partnership | 100.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest / dei_LegalEntityAxis = sgu_SubsidiariesTwoMember |  |
Petro Holdings, Inc |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Ownership interest of Star Acquisitions Inc. | 100.00%sgu_EquityMethodInvestmentAcquiredOwnershipPercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Number of full-service residential and commercial home heating oil and propane customers served | 448,000 sgu_NumberOfFullServiceResidentialAndCommercialHomeHeatingOilAndPropaneCustomersServed / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Number of customers to whom only home heating oil, gasoline and diesel fuel were sold on a delivery only basis | 73,000 sgu_NumberOfCustomersToWhomOnlyHomeHeatingOilGasolineAndDieselFuelWereSoldOnDeliveryOnlyBasis / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Number of customers to whom ancillary services were provided | 23,000 sgu_NumberOfCustomersToWhomAncillaryServicesWereProvided / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Star Gas Finance Company |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Ownership interest of partnership | 100.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest / dei_LegalEntityAxis = sgu_SubsidiariesThreeMember |  |
Common Stock |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Number of outstanding units | 57,282 us-gaap_PartnersCapitalAccountUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 57,405 us-gaap_PartnersCapitalAccountUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
General Partner |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Number of outstanding units | 326 us-gaap_PartnersCapitalAccountUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  | 326 us-gaap_PartnersCapitalAccountUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember

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- Definition Number of customers to whom home heating oil, gasoline and diesel fuel were sold on a delivery only basis. + References No definition available. + Details
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- Definition Number of Full-service residential and commercial home heating oil and propane customers served. + References No definition available. + Details
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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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