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Common Stock and Equity-Based Compensation - UGI Performance Unit Award Activity (Details) - $ / shares
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
UGI Performance Units and Stock Units          
UGI Units          
Number of units - beginning balance (in shares)     893,820    
Granted (in shares)     300,361 158,694 196,114
Number of units - ending balance (in shares) 831,274 893,820 831,274 893,820  
Weighted-Average Grant-Date Fair Value (per Unit)          
Weighted average grant date fair value - beginning balance (in dollars per share)     $ 36.39    
Granted (in dollars per share)     41.50 $ 55.40 $ 53.36
Weighted average grant date fair value - ending balance (in dollars per share) $ 39.95 $ 36.39 $ 39.95 $ 36.39  
UGI Performance Units          
UGI Units          
Granted (in shares)     222,410 29,784 52,314
Forfeited (in shares)     (13,734)    
Performance criteria not met (in shares)     (121,948)    
Weighted-Average Grant-Date Fair Value (per Unit)          
Granted (in dollars per share)     $ 41.85    
Forfeited (in dollars per share)     40.01    
Performance criteria not met (in dollars per share)     $ 46.76    
UGI Stock Units          
UGI Units          
Granted (in shares)     77,951    
Units awards paid (in shares)     (227,225)    
Weighted-Average Grant-Date Fair Value (per Unit)          
Granted (in dollars per share)     $ 40.38    
Units awards paid (in dollars per share)     $ 24.31    
Shares granted under stock awards (as a percentage)     70.00%    
UGI Restricted Stock Units          
Weighted-Average Grant-Date Fair Value (per Unit)          
Vested units (in shares) 441,498 616,319