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Summary of Significant Accounting Policies (Details)
3 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Ownership interests in certain subsidiaries under equity method investment, maximum 100.00%ugi_OwnershipInterestsInCertainSubsidiariesUnderEquityMethodInvestmentMaximum
Voting rights in investment businesses not traded publicly accounted for under the cost method, Maximum 20.00%ugi_VotingRightsInInvestmentBusinessesNotTradedPubliclyAccountedForUnderCostMethodMaximum