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, 2014	Sep. 30, 2013	Sep. 30, 2012
AmeriGas Performance Unit
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free rate	0.80%	0.40%	0.40%
Expected life	3 years	3 years	3 years
Expected volatility	21.10%	20.70%	23.00%
Dividend yield	7.50%	8.20%	6.40%