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Segment Information - Narrative (Details) | 12 Months Ended
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Sep. 30, 2017 county state segment
Segment Reporting [Abstract] |
Number of reportable segments | segment | 4
Number of states to which product sale with propane revenue | state | 50
Segment Reporting Information |
Number of counties | 1
UGI Utilities |
Segment Reporting Information |
Number of counties | 2

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- Definition Counties Of Operation, Number + References No definition available. + Details
Name: | ugi_CountiesOfOperationNumber
Namespace Prefix: | ugi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of States To Which Product Sale With Propane Revenue + References No definition available. + Details
Name: | ugi_NumberOfStatesToWhichProductSaleWithPropaneRevenue
Namespace Prefix: | ugi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=ugi_UgiUtilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |