Inventories (Details Textual) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012 ft3	Sep. 30, 2011 ft3	Mar. 31, 2011 ft3
Inventories (Textual) [Abstract]
Volume of gas storage inventories released under SCAAs with non-affiliates (In Cubic Feet)	600,000,000	3,900,000,000	400,000,000
Carrying value of gas storage inventories released under SCAAs with non-affiliates	$ 2.9	$ 19.0	$ 1.6

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