Inventories (Details Textual) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012 ft3	Dec. 31, 2011 ft3
Inventories (Textual) [Abstract]
Volume of gas storage inventories released under SCAAs with non-affiliates (in cubic feet)	3,800,000,000	3,300,000,000
Carrying value of gas storage inventories released under SCAAs with non-affiliates	$ 11.4	$ 15.7

Carrying amount as of the balance sheet date of natural gas storage inventories released under SCAA's with non-affiliates.

No definition available.

Name:	ugi_StorageInventoryReleased
Namespace Prefix:	ugi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant