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Common Stock and Equity-Based Compensation - UGI Performance Unit Award Activity (Details) - $ / shares
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
UGI Performance Units and Stock Units          
UGI Units          
Number of units - beginning balance (in shares)     959,718    
Granted (in shares)     158,694 196,114 185,379
Number of units - ending balance (in shares) 893,820 959,718 893,820 959,718  
Weighted-Average Grant-Date Fair Value (per Unit)          
Weighted average grant date fair value - beginning balance (in dollars per share)     $ 32.38    
Granted (in dollars per share)     55.40 $ 53.36 $ 50.08
Weighted average grant date fair value - ending balance (in dollars per share) $ 36.39 $ 32.38 $ 36.39 $ 32.38  
UGI Performance Units          
UGI Units          
Granted (in shares)     128,910 52,314,000,000 42,079,000,000
Forfeited (in shares)     (13,102)    
Awards paid (in shares)     (144,521)    
Weighted-Average Grant-Date Fair Value (per Unit)          
Granted (in dollars per share)     $ 55.40    
Forfeited (in dollars per share)     53.29    
Awards paid (in dollars per share)     $ 34.62    
UGI Stock Units          
UGI Units          
Granted (in shares)     29,784    
Forfeited (in shares)     (4,900)    
Awards paid (in shares)     (62,069)    
Weighted-Average Grant-Date Fair Value (per Unit)          
Granted (in dollars per share)     $ 55.39    
Forfeited (in dollars per share)     51.22    
Awards paid (in dollars per share)     $ 25.12    
Shares granted under stock awards (percentage)     70.00%    
UGI Restricted Stock Units          
Weighted-Average Grant-Date Fair Value (per Unit)          
Vested units (in shares) 616,319 660,795