Common Stock and Equity Based Compensation - Assumptions Used for Valuing Option Grants (Details) (UGI Stock Option Awards)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Weighted average assumptions used to determine the fair value of UGI Performance Unit awards and related compensation costs
Expected life of option	5 years 9 months	5 years 9 months	5 years 9 months
Weighted average volatility	24.30%	24.90%	24.70%
Weighted average dividend yield	2.90%	3.60%	3.50%
Minimum
Weighted average assumptions used to determine the fair value of UGI Performance Unit awards and related compensation costs
Expected volatility	23.70%	24.40%	24.70%
Expected dividend yield	2.70%	3.20%	3.30%
Risk-free rate	1.80%	0.80%	0.80%
Maximum
Weighted average assumptions used to determine the fair value of UGI Performance Unit awards and related compensation costs
Expected volatility	24.40%	24.90%	24.70%
Expected dividend yield	2.90%	3.70%	3.70%
Risk-free rate	2.00%	1.70%	1.10%