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Debt (Details) (USD $)
 6 Months Ended
Mar. 31, 2015
Mar. 27, 2015
UGI Utilities 2015 Credit Agreement    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity   $ 300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ugu_UGIUtilities2015CreditAgreementDomain
Sublimit for letters of credit   100,000,000ugu_RevolvingCreditAgreementSublimitForLettersOfCredit
/ us-gaap_CreditFacilityAxis
= ugu_UGIUtilities2015CreditAgreementDomain
UGI Utilities 2011 Credit Agreement    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity   $ 300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ugu_UGIUtilities2011CreditAgreementDomain
Minimum | UGI Utilities 2015 Credit Agreement    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= ugu_UGIUtilities2015CreditAgreementDomain
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum | UGI Utilities 2015 Credit Agreement    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= ugu_UGIUtilities2015CreditAgreementDomain
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Ratio of consolidated debt to consolidated capital 0.65ugu_RatioofConsolidatedDebttoConsolidatedCapital
/ us-gaap_CreditFacilityAxis
= ugu_UGIUtilities2015CreditAgreementDomain
/ us-gaap_RangeAxis
= us-gaap_MaximumMember