Inventories (Details Textual) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013 ft3 Storage_Agreement	Sep. 30, 2013 ft3
Public Utilities, Inventory [Line Items]
Number Of Storage Agreements	4
Volume of gas storage inventories released under SCAAs with non-affiliates (in cubic feet)	3,100,000,000	3,800,000,000
Carrying value of gas storage inventories released under SCAAs with non-affiliates	$ 12.3	$ 11.4

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