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Offsetting of Financial Assets (Liabilities) and Derivative Assets (liabilities) (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Net Assets (Liabilities) Presented in the Statement of Financial Position | $ 569 us-gaap_DerivativeAssetsCurrent | $ 2,342 us-gaap_DerivativeAssetsCurrent
Net Assets (Liabilities) Presented in the Statement of Financial Position | (7,650)us-gaap_DerivativeLiabilitiesCurrent | (12,358)us-gaap_DerivativeLiabilitiesCurrent
Subject to an enforceable master netting arrangement |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 35,659 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 26,263 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Gross Liabilities Offset in the Statement of Financial Position | (42,710)us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | (36,279)us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Assets (Liabilities) Presented in the Statement of Financial Position | (7,051)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | (10,016)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Financial Instruments | 0 sgu_DerivativeFairValueGrossAmountNotOffsetFinancialInstrumentsNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 0 sgu_DerivativeFairValueGrossAmountNotOffsetFinancialInstrumentsNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Cash Collateral Received | 0 sgu_CashCollateralReceivedFromNotOffsetAgainstDerivativeAssetsAndLiabilities / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 0 sgu_CashCollateralReceivedFromNotOffsetAgainstDerivativeAssetsAndLiabilities / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Amount | (7,051)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | (10,016)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Subject to an enforceable master netting arrangement | Fair liability and fair asset value of derivative instruments |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 26,407 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 23,921 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Gross Liabilities Offset in the Statement of Financial Position | (34,057)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | (36,279)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Assets (Liabilities) Presented in the Statement of Financial Position | (7,650)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | (12,358)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Financial Instruments | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Cash Collateral Received | 0 us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 0 us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Amount | (7,650)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | (12,358)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Subject to an enforceable master netting arrangement | Fair asset and fair liability value of derivative instruments |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 8,159 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 2,342 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Gross Liabilities Offset in the Statement of Financial Position | (7,590)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Net Assets (Liabilities) Presented in the Statement of Financial Position | 569 us-gaap_DerivativeAssetsCurrent / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 2,342 us-gaap_DerivativeAssetsCurrent / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Financial Instruments | 0 us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 0 us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Cash Collateral Received | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Amount | 569 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember | 2,342 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Subject to an enforceable master netting arrangement | Long-term derivative liabilities included in other long-term liabilities balance |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 421 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Gross Liabilities Offset in the Statement of Financial Position | (513)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Net Assets (Liabilities) Presented in the Statement of Financial Position | (92)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Financial Instruments | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Cash Collateral Received | 0 us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Net Amount | (92)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Subject to an enforceable master netting arrangement | Long-term derivative assets included in the deferred charges and other assets, net balance |  |
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items] |  |
Gross Assets Recognized | 672 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Gross Liabilities Offset in the Statement of Financial Position | (550)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Net Assets (Liabilities) Presented in the Statement of Financial Position | 122 us-gaap_DerivativeAssetsCurrent / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Financial Instruments | 0 us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Cash Collateral Received | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |
Net Amount | $ 122 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember |

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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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