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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, 2020
$ / shares
shares
Under $30.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, upper limit (in dollars per share) $ 30.00
Options outstanding at September 30, 2020  
Number of options (in shares) | shares 2,672,041
Weighted average remaining contractual life (in years) 2 years 2 months 12 days
Weighted average exercise price (in dollars per share) $ 23.46
Options exercisable at September 30, 2020  
Number of options (in shares) | shares 2,669,481
Weighted average exercise price (in dollars per share) $ 23.45
$30.00 – $35.00  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, lower limit (in dollars per share) 30.00
Range of exercise prices, upper limit (in dollars per share) $ 35.00
Options outstanding at September 30, 2020  
Number of options (in shares) | shares 1,297,358
Weighted average remaining contractual life (in years) 5 years 10 months 24 days
Weighted average exercise price (in dollars per share) $ 33.30
Options exercisable at September 30, 2020  
Number of options (in shares) | shares 1,041,488
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
Options outstanding at September 30, 2020  
Number of options (in shares) | shares 858,565
Weighted average remaining contractual life (in years) 4 years 2 months 12 days
Weighted average exercise price (in dollars per share) $ 37.82
Options exercisable at September 30, 2020  
Number of options (in shares) | shares 858,565
Weighted average exercise price (in dollars per share) $ 37.82
$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) $ 45.00
Options outstanding at September 30, 2020  
Number of options (in shares) | shares 177,947
Weighted average remaining contractual life (in years) 7 years 10 months 24 days
Weighted average exercise price (in dollars per share) $ 44.07
Options exercisable at September 30, 2020  
Number of options (in shares) | shares 172,497
Weighted average exercise price (in dollars per share) $ 44.12
Over $45.01  
Share-based Compensation Arrangement by Share-based Payment Award  
Range of exercise prices, lower limit (in dollars per share) $ 45.01
Options outstanding at September 30, 2020  
Number of options (in shares) | shares 4,983,623
Weighted average remaining contractual life (in years) 7 years 9 months 18 days
Weighted average exercise price (in dollars per share) $ 48.00
Options exercisable at September 30, 2020  
Number of options (in shares) | shares 2,156,220
Weighted average exercise price (in dollars per share) $ 48.28