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Common Stock and Equity Based Compensation - Additional Information Relating to Stock Options Outstanding and Exercisable (Details) - UGI Stock Option Awards
12 Months Ended
Sep. 30, 2015
$ / shares
shares
Under $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 $ 0
Number of options | shares 2,956,873
Weighted average remaining contractual life (in years) 4 years 10 months 18 days
Weighted average exercise price $ 18.21
Number of options | shares 2,835,673
Weighted average exercise price $ 18.15
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit 20.00
$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 | shares 3,178,416
Weighted average remaining contractual life (in years) 6 years 3 months 18 days
Weighted average exercise price $ 21.47
Number of options | shares 2,475,420
Weighted average exercise price $ 21.38
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit 25.00
$25.01 - $30.00  
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 | shares 1,713,903
Weighted average remaining contractual life (in years) 8 years 1 month 18 days
Weighted average exercise price $ 27.46
Number of options | shares 634,602
Weighted average exercise price $ 27.29
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit 30.00
Over $30.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 30.00
Number of options | shares 1,406,185
Weighted average remaining contractual life (in years) 9 years 2 months 18 days
Weighted average exercise price $ 37.45
Number of options | shares 105,251
Weighted average exercise price $ 35.93