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Inventories - Narrative (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 ft3 Storage_Agreement | Sep. 30, 2013 ft3
--- | --- | ---
Inventory [Line Items] |  |
Number of Storage Agreements | 4 |
Volume of gas storage inventories released under SCAAs with non-affiliates (in cubic feet) | 200,000,000 | 600,000,000
Carrying value of gas storage inventories released under SCAAs with non-affiliates | $ 0.8 | $ 2.4
Minimum |  |
Inventory [Line Items] |  |
SCAA Contract Term, in years | 1 year |
Maximum |  |
Inventory [Line Items] |  |
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

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: | instant

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

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