Common Stock And Equity Based Compensation - AmeriGas Common Unit Based Awards in Common Units and Cash (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
AmeriGas Performance Unit
Share-based Compensation Arrangement by Share-based Payment Award
Number of Common Units subject to original awards granted	41,251	48,150	53,600
Fiscal year granted	2011	2010	2009
Payment of awards:
AmeriGas Partners Common Units issued	0	0	0
Cash paid	$ 0	$ 0	$ 0
AmeriGas Partners Common Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of Common Units subject to original awards granted	72,023	35,934	67,246
Payment of awards:
AmeriGas Partners Common Units issued	40,842	23,192	44,016
Cash paid	$ 1.4	$ 0.6	$ 1.0