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Inventories - Narrative (Details) - UGI Utilities | 6 Months Ended
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Mar. 31, 2020 storage_agreement
Inventory |
Number of storage agreements | 3
SCAA contract term (up to) | 3 years

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- Definition Number of Storage Contract Administrative Agreements + References No definition available. + Details
Name: | ugi_NumberOfStorageContractAdministrativeAgreements
Namespace Prefix: | ugi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Storage Agreement Term + References No definition available. + Details
Name: | ugi_StorageAgreementTerm
Namespace Prefix: | ugi_
Data Type: | xbrli:durationItemType
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_PublicUtilitiesInventoryLineItems
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: |