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Supplemental Disclosure of Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Non-cash investing activities: |  |
Acquisition of NYC heating oil customer list | $ 886 sgu_NoncashIncreaseInIntangibleAssetsFromBusinessCombination |
Non-cash financing activities: |  |
Increase in interest expense-amortization of debt discount on 8.875% Senior Notes | 30 us-gaap_AmortizationOfDebtDiscountPremium | 27 us-gaap_AmortizationOfDebtDiscountPremium
Income taxes, net | 11,116 us-gaap_IncomeTaxesPaidNet | 6,740 us-gaap_IncomeTaxesPaidNet
Interest | $ 6,233 us-gaap_InterestPaidNet | $ 6,208 us-gaap_InterestPaidNet

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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