Common Stock And Equity Based Compensation - AmeriGas Common Unit Based Awards in Common Units and Cash (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
AmeriGas Performance Unit
Share-based Compensation Arrangement by Share-based Payment Award
Number of Common Units subject to original awards granted	55,750	41,251	48,150
Fiscal year granted	2012	2011	2010
Payment of awards:
AmeriGas Partners Common Units issued	0	0	0
Cash paid	$ 0.0	$ 0.0	$ 0.0
AmeriGas Partners Common Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of Common Units subject to original awards granted	42,532	72,023	35,934
Payment of awards:
AmeriGas Partners Common Units issued	21,509	40,842	23,192
Cash paid	$ 0.8	$ 1.4	$ 0.6