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Nature of Operations (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
General Partner held a general partner interest in AmeriGas Partners 1.00%ugi_GeneralPartnersInterestPercentage  
Percentage of limited partnership interest in AmeriGas Partners 25.30%ugi_GeneralPartnerLimitedPartnerInterest  
Effective ownership interest in AmeriGas OLP 27.10%ugi_GeneralPartnersEffectiveOwnershipPercentageInRelatedParties  
Limited Partnership Common Units held in AmeriGas Partners (in units) 23,756,882ugi_SubsidiaryCommonUnitsOwned  
General public as limited partner interests in AmeriGas Partners 73.70%ugi_SubsidiaryPercentageCommonUnitsOwnedByPublic  
Common Units owned by public (in units) 69,131,947ugi_SubsidiaryCommonUnitsOwnedByPublic  
General Partner incentive distribution $ 13.1us-gaap_IncentiveDistributionDistributionPerYear $ 10.8us-gaap_IncentiveDistributionDistributionPerYear