Common Stock and Equity Based Compensation - Assumptions Used for Valuing Option Grants (Details) - UGI Stock Option Awards	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Weighted average assumptions used to determine the fair value of UGI Performance Unit awards and related compensation costs
Expected life of option (in years)	5 years 9 months	5 years 9 months	5 years 9 months
Weighted average volatility	19.50%	24.30%	24.90%
Weighted average dividend yield	2.50%	2.90%	3.60%
Expected dividend yield	2.50%
Minimum
Weighted average assumptions used to determine the fair value of UGI Performance Unit awards and related compensation costs
Expected volatility	19.10%	23.70%	24.40%
Expected dividend yield		2.70%	3.20%
Risk-free rate	1.50%	1.80%	0.80%
Maximum
Weighted average assumptions used to determine the fair value of UGI Performance Unit awards and related compensation costs
Expected volatility	19.50%	24.40%	24.90%
Expected dividend yield		2.90%	3.70%
Risk-free rate	1.80%	2.00%	1.70%