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Common Stock and Equity-Based Compensation - AmeriGas Common Unit Based Award Activity (Details) - $ / shares			12 Months Ended
	Aug. 21, 2019	Sep. 30, 2018	Sep. 30, 2019
Amerigas Performance Units and Stock Units
AmeriGas Partners Common Units
Number of units - beginning balance (in shares)			236,762
Number of units - ending balance (in shares)		236,762	0
Weighted-Average Grant-Date Fair Value (per Unit)
Weighted average grant date fair value - beginning balance (in dollars per share)			$ 47.12
Weighted average grant date fair value - ending balance (in dollars per share)		$ 47.12	$ 0
AmeriGas Performance Units
AmeriGas Partners Common Units
Granted (in shares)			79,980
Forfeited (in shares)			(42,916)
Awards paid (in shares)			(17,133)
Performance criteria not met (in share)			(29,394)
Units converted to UGI cash-settled restricted units (in shares)	(137,472)
Weighted-Average Grant-Date Fair Value (per Unit)
Granted (in dollars per share)			$ 30.23
Forfeited (in dollars per share)			46.83
Awards paid (in dollars per share)			43.02
Performance criteria not met (in dollars per share)			$ 34.27
AmeriGas Stock Units
AmeriGas Partners Common Units
Granted (in shares)			53,118
Forfeited (in shares)			(800)
Awards paid (in shares)			(16,056)
Units converted to UGI cash-settled restricted units (in shares)	(126,089)		(263,561)
Number of units - ending balance (in shares)	263,561
Weighted-Average Grant-Date Fair Value (per Unit)
Granted (in dollars per share)			$ 31.10
Forfeited (in dollars per share)			45.30
Awards paid (in dollars per share)			40.98
Units converted to UGI cash-settled restricted units (in dollars per share)			$ (40.89)
Weighted average grant date fair value - ending balance (in dollars per share)	$ 40.89
Amerigas Restricted Stock Units
Weighted-Average Grant-Date Fair Value (per Unit)
Vested units (in shares)		71,148

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