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Summary of Significant Accounting Policies (Details) | 6 Months Ended
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Mar. 31, 2015
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

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- Definition Ownership interests in certain subsidiaries under equity method investment, maximum + References No definition available. + Details
Name: | ugi_OwnershipInterestsInCertainSubsidiariesUnderEquityMethodInvestmentMaximum
Namespace Prefix: | ugi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Voting rights in investment businesses not traded publicly accounted for under the cost method, Maximum + References No definition available. + Details
Name: | ugi_VotingRightsInInvestmentBusinessesNotTradedPubliclyAccountedForUnderCostMethodMaximum
Namespace Prefix: | ugi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration