Common Stock and Equity Based Compensation - Weighted Average Assumptions Used to Determine the Fair Value of UGI Performance Unit Awards and Related Compensation Costs (Details) (UGI Performance Units)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
UGI Performance Units
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	20.30%	21.10%	22.20%
Dividend yield	2.70%	3.30%	3.50%