Inventories (Details Textual) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012 ft3	Sep. 30, 2011 ft3	Sep. 30, 2012 UGI Utilities [Member] Storage Contract Administrative Agreements [Member] Storage_Agreement	Sep. 30, 2012 UGI Utilities [Member] Expires in October 2012 [Member] Storage Contract Administrative Agreements [Member] Storage_Agreement	Sep. 30, 2012 UGI Utilities [Member] Expires in October 2013 [Member] Storage Contract Administrative Agreements [Member] Storage_Agreement	Nov. 01, 2012 UGI Utilities [Member] New Storage Agreement [Member] Storage Contract Administrative Agreements [Member] Storage_Agreement
Public Utilities, Inventory [Line Items]
Number of storage agreements (in storage agreements)			3	2	1	2
Volume of gas storage inventories released under SCAAs with non-affiliates (In Cubic Feet)	3,800,000,000	3,900,000,000
Carrying value of gas storage inventories released under SCAAs with non-affiliates	$ 11.4	$ 19.0
Storage Agreement Term						3 years