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Inventories (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 Bcf Storage_Agreement | Sep. 30, 2014 Bcf | Mar. 31, 2014 Bcf
Inventory Disclosure [Abstract] |  |  |
Number of storage agreements | 3 ugi_NumberOfStorageContractAdministrativeAgreements |  |
SCAA contract term (in years) | 3 years |  |
Volume of gas storage inventories released under SCAAs with non-affiliates (in cubic feet) | 0.2 ugi_VolumeOfGasStorageInventoriesReleased | 3.9 ugi_VolumeOfGasStorageInventoriesReleased | 0.2 ugi_VolumeOfGasStorageInventoriesReleased
Carrying value of gas storage inventories released under SCAAs with non-affiliates | $ 0.7 ugi_StorageInventoryReleased | $ 16.8 ugi_StorageInventoryReleased | $ 0.8 ugi_StorageInventoryReleased

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 SCAA Contract Term, in years + References No definition available. + Details
Name: | ugi_SCAAContractTerminyears
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

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