Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 UGI Energy Services, Inc. [Member]	Sep. 30, 2012 UGI Energy Services, Inc. [Member]	Sep. 30, 2011 UGI Energy Services, Inc. [Member]	Sep. 30, 2013 SCAAs [Member] UGI Energy Services, Inc. [Member] Storage_Agreement	Sep. 30, 2012 SCAAs [Member] UGI Energy Services, Inc. [Member]	Sep. 30, 2011 SCAAs [Member] UGI Energy Services, Inc. [Member]	Sep. 30, 2013 Exclusive of transactions pursuant SCAAs [Member] UGI Energy Services, Inc. [Member]	Sep. 30, 2012 Exclusive of transactions pursuant SCAAs [Member] UGI Energy Services, Inc. [Member]	Sep. 30, 2011 Exclusive of transactions pursuant SCAAs [Member] UGI Energy Services, Inc. [Member]	Sep. 30, 2013 Other current liabilities [Member] SCAAs [Member] UGI Energy Services, Inc. [Member]	Sep. 30, 2012 Other current liabilities [Member] SCAAs [Member] UGI Energy Services, Inc. [Member]	Sep. 30, 2013 Inventories [Member] UGI Energy Services, Inc. [Member] ft3	Sep. 30, 2012 Inventories [Member] UGI Energy Services, Inc. [Member] ft3	Sep. 30, 2013 SCAAs [Member] Storage_Agreement	Nov. 01, 2013 SCAAs [Member] New Storage Agreement [Member]	Nov. 01, 2013 UGI Energy Services, Inc. [Member] SCAAs [Member] New Storage Agreement [Member]
Related Party Transaction [Line Items]
Number of storage agreements							3										3
Storage agreement, term (in years)							3 years											3 years	1 year
Related party costs incurred	$ 8,366	$ 9,326	$ 12,125				$ 45,843	$ 24,344	$ 35,231	$ 32,526	$ 30,752	$ 30,093
Related party security deposits													16,500	15,000
Volume of gas storage inventory (in bcf of natural gas)															10,400,000,000	7,600,000,000
Natural gas storage inventory, related parties, current															41,988	21,217
Revenue from related parties				69,087	65,705	85,655
Purchases from related party				$ 77,017	$ 53,435	$ 53,617