Common Stock and Equity Based Compensation Common Stock and Equity Based Compensation - Additional Information Relating to Stock Options Outstanding and Exercisable (Details) (UGI Stock Option Awards, USD $)	12 Months Ended
	Sep. 30, 2014
Under $15.00
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 0
Number of options	102,000
Weighted average remaining contractual life (in years)	1 year 4 months 24 days
Weighted average exercise price	$ 14.47
Number of options	102,000
Weighted average exercise price	$ 14.47
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 15.00
$15.01 - $20.00
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 15.01
Number of options	3,452,480
Weighted average remaining contractual life (in years)	5 years 8 months 12 days
Weighted average exercise price	$ 18.15
Number of options	2,727,509
Weighted average exercise price	$ 17.81
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 20
$20.01 - $25.00
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 20.01
Number of options	3,500,910
Weighted average remaining contractual life (in years)	7 years 2 months 12 days
Weighted average exercise price	$ 21.45
Number of options	2,077,840
Weighted average exercise price	$ 21.27
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 25
Over $25.00
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 25.01
Number of options	1,901,900
Weighted average remaining contractual life (in years)	9 years 2 months 12 days
Weighted average exercise price	$ 27.74
Number of options	165,998
Weighted average exercise price	$ 26.85