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Common Stock and Equity-Based Compensation - AmeriGas Common Unit Based Award Activity (Details)
12 Months Ended
Sep. 30, 2018
$ / shares
shares
Amerigas Performance Units and Stock Units  
AmeriGas Partners Common Units  
Number of units - beginning balance (in shares) 218,224
Number of units - ending balance (in shares) 236,762
Weighted-Average Grant-Date Fair Value (per Unit)  
Weighted average grant date fair value - beginning balance (in dollars per share) | $ / shares $ 50.03
Weighted average grant date fair value - ending balance (in dollars per share) | $ / shares $ 47.12
AmeriGas Performance Units  
AmeriGas Partners Common Units  
Granted (in shares) 55,550
Forfeited (in shares) (1,900)
Awards paid (in shares) (18,874)
Performance criteria not met (in dollars per share) (37,099)
Weighted-Average Grant-Date Fair Value (per Unit)  
Granted (in dollars per share) | $ / shares $ 52.14
Forfeited (in dollars per share) | $ / shares 56.70
Awards paid (in dollars per share) | $ / shares 46.23
Performance criteria not met (in dollars per share) | $ / shares $ 86.53
AmeriGas Stock Units  
AmeriGas Partners Common Units  
Granted (in shares) 29,261
Forfeited (in shares) (400)
Awards paid (in shares) (8,000)
Weighted-Average Grant-Date Fair Value (per Unit)  
Granted (in dollars per share) | $ / shares $ 46.09
Forfeited (in dollars per share) | $ / shares 45.66
Awards paid (in dollars per share) | $ / shares $ (45.62)
Vested | Amerigas Performance Units and Stock Units  
AmeriGas Partners Common Units  
Number of units - beginning balance (in shares) 65,989
Number of units - ending balance (in shares) 71,148