Common Stock And Equity Based Compensation - Weighted Average Assumption Used to Determine the Fair Value of AmeriGas Performance Unit Awards and Related Compensation Costs (Details) - AmeriGas Performance Unit	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free rate	0.90%	0.80%	0.40%
Expected life (in years)	3 years	3 years	3 years
Expected volatility	19.20%	21.10%	20.70%
Dividend yield	6.80%	7.50%	8.20%