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Inventories - Narrative (Details) - UGI Utilities $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) storage_agreement Bcf | Sep. 30, 2016 USD ($) Bcf
Public Utilities, Inventory |  |
Number of storage agreements | storage_agreement | 5 |
Volume of gas storage inventories released under SCAAs with non-affiliates (in cubic feet) | Bcf | 2.3 | 3.5
Carrying value of gas storage inventories released under SCAAs with non-affiliates | $ | $ 6.7 | $ 7.6
Minimum |  |
Public Utilities, Inventory |  |
Storage agreement term (in years) | 1 year |
Maximum |  |
Public Utilities, Inventory |  |
Storage agreement 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

X
- 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

X
- 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

X
- 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_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |