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Common Stock and Equity-Based Compensation - AmeriGas Common Unit Based Award Activity (Details)
12 Months Ended
Sep. 30, 2017
$ / shares
shares
Amerigas Performance Units and Stock Units  
Number of AmeriGas Partners Common Units Subject to Award  
Number of units - beginning balance (in shares) | shares 210,549
Number of units - ending balance (in shares) | shares 218,224
Weighted Average Grant Date Fair Value (per Unit)  
Weighted average grant date fair value - beginning balance (in dollars per share) | $ / shares $ 47.24
Weighted average grant date fair value - ending balance (in dollars per share) | $ / shares $ 50.03
AmeriGas Performance Units  
Number of AmeriGas Partners Common Units Subject to Award  
Granted (in shares) | shares 49,225
Forfeited (in shares) | shares (9,151)
Vested (in shares) | shares 0
Awards paid (in shares) | shares (44,732)
Weighted Average Grant Date Fair Value (per Unit)  
Granted (in dollars per share) | $ / shares $ 54.24
Forfeited (in dollars per share) | $ / shares 48.76
Vested (in dollars per share) | $ / shares 0.00
Awards paid (in dollars per share) | $ / shares $ 41.53
AmeriGas Stock Units  
Number of AmeriGas Partners Common Units Subject to Award  
Granted (in shares) | shares 18,338
Vested (in shares) | shares 0
Awards paid (in shares) | shares (6,005)
Weighted Average Grant Date Fair Value (per Unit)  
Granted (in dollars per share) | $ / shares $ 47.33
Vested (in dollars per share) | $ / shares 0.00
Awards paid (in dollars per share) | $ / shares $ 43.64
Vested | Amerigas Performance Units and Stock Units  
Number of AmeriGas Partners Common Units Subject to Award  
Number of units - beginning balance (in shares) | shares 55,622
Number of units - ending balance (in shares) | shares 65,989
Weighted Average Grant Date Fair Value (per Unit)  
Weighted average grant date fair value - beginning balance (in dollars per share) | $ / shares $ 45.67
Weighted average grant date fair value - ending balance (in dollars per share) | $ / shares $ 47.31
Vested | AmeriGas Performance Units  
Number of AmeriGas Partners Common Units Subject to Award  
Granted (in shares) | shares 633
Forfeited (in shares) | shares 0
Vested (in shares) | shares 40,933
Awards paid (in shares) | shares (44,732)
Weighted Average Grant Date Fair Value (per Unit)  
Granted (in dollars per share) | $ / shares $ 54.45
Forfeited (in dollars per share) | $ / shares 0.00
Vested (in dollars per share) | $ / shares 42.55
Awards paid (in dollars per share) | $ / shares $ 41.53
Vested | AmeriGas Stock Units  
Number of AmeriGas Partners Common Units Subject to Award  
Granted (in shares) | shares 12,738
Vested (in shares) | shares 6,800
Awards paid (in shares) | shares (6,005)
Weighted Average Grant Date Fair Value (per Unit)  
Granted (in dollars per share) | $ / shares $ 48.06
Vested (in dollars per share) | $ / shares 46.13
Awards paid (in dollars per share) | $ / shares $ 43.64
Non-Vested | Amerigas Performance Units and Stock Units  
Number of AmeriGas Partners Common Units Subject to Award  
Number of units - beginning balance (in shares) | shares 154,927
Number of units - ending balance (in shares) | shares 152,235
Weighted Average Grant Date Fair Value (per Unit)  
Weighted average grant date fair value - beginning balance (in dollars per share) | $ / shares $ 47.80
Weighted average grant date fair value - ending balance (in dollars per share) | $ / shares $ 51.21
Non-Vested | AmeriGas Performance Units  
Number of AmeriGas Partners Common Units Subject to Award  
Granted (in shares) | shares 48,592
Forfeited (in shares) | shares (9,151)
Vested (in shares) | shares 40,933
Awards paid (in shares) | shares 0
Weighted Average Grant Date Fair Value (per Unit)  
Granted (in dollars per share) | $ / shares $ 54.24
Forfeited (in dollars per share) | $ / shares 48.76
Vested (in dollars per share) | $ / shares 42.55
Awards paid (in dollars per share) | $ / shares $ 0.00
Non-Vested | AmeriGas Stock Units  
Number of AmeriGas Partners Common Units Subject to Award  
Granted (in shares) | shares 5,600
Vested (in shares) | shares 6,800
Awards paid (in shares) | shares 0
Weighted Average Grant Date Fair Value (per Unit)  
Granted (in dollars per share) | $ / shares $ 45.66
Vested (in dollars per share) | $ / shares 46.13
Awards paid (in dollars per share) | $ / shares $ 0.00