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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, 2018
$ / shares
shares
Exercise Price Range, Over Forty [Member]  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, lower limit (in dollars per share) $ 40
Under $25.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, lower limit (in dollars per share) 0
Range of exercise prices, upper limit (in dollars per share) $ 25
Number of options (in shares) | shares 2,322,904
Weighted average remaining contractual life (in years) 3 years 4 months
Weighted average exercise price (in dollars per share) $ 20.53
Number of options (in shares) | shares 2,322,904
Weighted average exercise price (in dollars per share) $ 20.53
$25.00 – $30.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Number of options (in shares) | shares 1,133,676
Weighted average remaining contractual life (in years) 5 years
Weighted average exercise price (in dollars per share) $ 27.38
Number of options (in shares) | shares 1,133,676
Weighted average exercise price (in dollars per share) $ 27.38
$30.01 – $35.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, lower limit (in dollars per share) 25
Range of exercise prices, upper limit (in dollars per share) $ 30
Number of options (in shares) | shares 1,150,685
Weighted average remaining contractual life (in years) 7 years 1 month
Weighted average exercise price (in dollars per share) $ 33.66
Number of options (in shares) | shares 714,201
Weighted average exercise price (in dollars per share) $ 33.59
$35.01 – $40.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, lower limit (in dollars per share) 30.01
Range of exercise prices, upper limit (in dollars per share) $ 35
Number of options (in shares) | shares 917,843
Weighted average remaining contractual life (in years) 6 years 3 months
Weighted average exercise price (in dollars per share) $ 37.80
Number of options (in shares) | shares 809,899
Weighted average exercise price (in dollars per share) $ 37.81
Over $40.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Number of options (in shares) | shares 2,671,961
Weighted average remaining contractual life (in years) 8 years 9 months
Weighted average exercise price (in dollars per share) $ 47.16
Number of options (in shares) | shares 517,650
Weighted average exercise price (in dollars per share) $ 46.46
Exercise Price Range, Between Thirty-Five and Forty Dollars [Member]  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, lower limit (in dollars per share) 35.01
Range of exercise prices, upper limit (in dollars per share) $ 40