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Common Stock and Equity-Based Compensation - UGI Performance Unit Award Activity (Details) - $ / shares
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
UGI Performance Units and Stock Units      
UGI Units      
Number of units - beginning balance (in shares) 978,834    
Granted (in shares) 196,114 185,379 230,653
Number of units - ending balance (in shares) 959,718 978,834  
Weighted-Average Grant-Date Fair Value (per Unit)      
Weighted average grant date fair value - beginning balance (in dollars per share) $ 28.83    
Granted (in dollars per share) 53.36 $ 50.08 $ 33.04
Weighted average grant date fair value - ending balance (in dollars per share) $ 32.38 $ 28.83  
UGI Performance Units      
UGI Units      
Granted (in shares) 143,800 42,079,000,000 52,493,000,000
Forfeited (in shares) (38,542)    
Performance criteria not met (in shares) (43,672)    
Awards paid (in shares) (92,950)    
Weighted-Average Grant-Date Fair Value (per Unit)      
Granted (in dollars per share) $ 55.26    
Forfeited (in dollars per share) 41.19    
Performance criteria not met (in dollars per share) 37.57    
Awards paid (in dollars per share) $ 37.85    
UGI Stock Units      
UGI Units      
Granted (in shares) 52,314    
Awards paid (in shares) (40,066)    
Weighted-Average Grant-Date Fair Value (per Unit)      
Granted (in dollars per share) $ 48.11    
Awards paid (in dollars per share) $ 21.39    
Shares granted under stock awards (percentage) 70.00%    
Vested | UGI Performance Units and Stock Units      
UGI Units      
Number of units - beginning balance (in shares) 660,886    
Number of units - ending balance (in shares) 660,795 660,886