Debt Textual (Details) (USD $) In Thousands, unless otherwise specified					12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 UGI Utilities 2011 Credit Agreement [Member]	Sep. 30, 2011 UGI Utilities 2011 Credit Agreement [Member]	Sep. 30, 2012 Letter of Credit [Member] UGI Utilities 2011 Credit Agreement [Member]	Sep. 30, 2012 Minimum [Member] UGI Utilities 2011 Credit Agreement [Member]	Sep. 30, 2012 Maximum [Member] UGI Utilities 2011 Credit Agreement [Member]
Maturities of Long-term Debt [Abstract]
Due in Fiscal 9/30/2013	$ 133,000
Due in Fiscal 9/30/2014	0
Due in Fiscal 9/30/2015	20,000
Due in Fiscal 9/30/2016	247,000
Due in Fiscal 9/30/2017	20,000
Debt Instrument [Line Items]
Credit agreement		300,000
Revolving credit agreement sublimit for letters of credit				100,000
Margin on term loan base rate borrowings					0.00%	2.00%
Borrowings outstanding, amount		9,200
Line of Credit Facility, Interest Rate at Period End		1.21%
Credit agreement outstanding, amount		$ 2,000	$ 2,000