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, 2015	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free rate	1.10%	0.80%	0.40%
Expected life (in years)	3 years	3 years	3 years
Expected volatility	15.90%	20.30%	21.10%
Dividend yield	2.30%	2.70%	3.30%