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Inventories - Narrative (Details) - UGI Utilities $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) storage_agreement Bcf | Sep. 30, 2017 USD ($) Bcf | Jun. 30, 2017 USD ($) Bcf
Inventory |  |  |
Number of storage agreements | storage_agreement | 5 |  |
Volume of gas storage inventories released under SCAAs with non-affiliates (in bcf) | Bcf | 1.2 | 2.3 | 1.1
Carrying value of gas storage inventories released under SCAAs with non-affiliates | $ | $ 2.7 | $ 6.7 | $ 3.5
Maximum |  |  |
Inventory |  |  |
SCAA contract term (in years) | 3 years |  |

X
- 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 Carrying amount as of the balance sheet date of natural gas storage inventories released under SCAA's with non-affiliates. + References No definition available. + Details
Name: | ugi_StorageInventoryReleased
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Volume of gas storage inventories released. + References No definition available. + Details
Name: | ugi_VolumeOfGasStorageInventoriesReleased
Namespace Prefix: | ugi_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

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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: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |