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Partnership's Debt (Parenthetical) (Detail) (8.875% Senior Notes, USD $)
In Millions, unless otherwise specified
 6 Months Ended
Mar. 31, 2015
8.875% Senior Notes
  
Debt Instrument [Line Items]  
Senior notes issuance date Nov. 01, 2010
Interest accrued by public notes for each year 8.875%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= sgu_EightPointEightSevenFivePercentSeniorNotesMember
Discount on notes $ 0.4us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= sgu_EightPointEightSevenFivePercentSeniorNotesMember
Maximum debt allowed for acquisitions 100sgu_MaximumDebtAllowedForAcquisitions
/ us-gaap_LongtermDebtTypeAxis
= sgu_EightPointEightSevenFivePercentSeniorNotesMember
Restricted payments without passing certain financial tests $ 22sgu_RestrictedPaymentsWithoutPassingCertainFinancialTests
/ us-gaap_LongtermDebtTypeAxis
= sgu_EightPointEightSevenFivePercentSeniorNotesMember
Maturity of public notes due Dec. 01, 2017
Interest payment frequency Semi-annual interest payments on June 1 and December 1 of each year