Common Stock And Equity Based Compensation (Details 8) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of UGI Units, Granted	254,600		239,845	285,470
AmeriGas Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of UGI Units, Granted	20,336
AmeriGas Performance Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of UGI Units, Granted	44,800
AmeriGas Common Unit based awards in common Units and cash
Number of Common Units subject to original awards granted	54,750	[1]	60,200	41,064
Fiscal year granted	2010	[1]	2009	2008
Payment of Awards:
AmeriGas Partners common Units issued	3,850	[1]	3,500	35,787
Cash Paid	$ 0.1	[1]	$ 0.1	$ 1.2
Heritage Propane [Member]
Payment of Awards:
Cash Paid	$ 0		$ 0.9
Heritage Propane [Member] | AmeriGas Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of UGI Units, Granted	19,342		40,516

[1] In addition, during Fiscal 2013 and 2012, 19,342 AmeriGas Stock Units and $0.5 in cash, and 40,516 AmeriGas Stock Units and $0.9 in cash, respectively, were paid to former Heritage Propane employees associated with awards granted in Fiscal 2012.