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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, 2019
$ / shares
shares
Under $30.00  
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) $ 30
Number of options (in shares) | shares 2,879,501
Weighted average remaining contractual life (in years) 3 years 1 month 6 days
Weighted average exercise price (in dollars per share) $ 23.24
Number of options (in shares) | shares 2,879,501
Weighted average exercise price (in dollars per share) $ 23.24
$30.00 – $35.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, lower limit (in dollars per share) 30.0
Range of exercise prices, upper limit (in dollars per share) $ 35.00
Number of options (in shares) | shares 1,094,763
Weighted average remaining contractual life (in years) 6 years 1 month 6 days
Weighted average exercise price (in dollars per share) $ 33.66
Number of options (in shares) | shares 995,313
Weighted average exercise price (in dollars per share) $ 33.65
$35.01 – $40.00  
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) $ 40.00
Number of options (in shares) | shares 870,115
Weighted average remaining contractual life (in years) 5 years 3 months 18 days
Weighted average exercise price (in dollars per share) $ 37.81
Number of options (in shares) | shares 870,115
Weighted average exercise price (in dollars per share) $ 37.81
$40.01 – $45.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, lower limit (in dollars per share) 40.01
Range of exercise prices, upper limit (in dollars per share) $ 40
Number of options (in shares) | shares 81,593
Weighted average remaining contractual life (in years) 7 years 1 month 6 days
Weighted average exercise price (in dollars per share) $ 44.42
Number of options (in shares) | shares 76,593
Weighted average exercise price (in dollars per share) $ 44.48
Over $45.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, lower limit (in dollars per share) $ 40
Number of options (in shares) | shares 3,552,133
Weighted average remaining contractual life (in years) 8 years 3 months 18 days
Weighted average exercise price (in dollars per share) $ 49.25
Number of options (in shares) | shares 1,142,008
Weighted average exercise price (in dollars per share) $ 47.48