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Common Stock and Equity-Based Compensation - UGI Performance Unit Award Activity (Details) - $ / shares		12 Months Ended
		Sep. 30, 2016		Sep. 30, 2015	Sep. 30, 2014
UGI Performance Units and Stock Units
Number of UGI Units
Number of units - beginning balance (in shares)		1,136,251
Granted (in shares)		230,653		180,724	234,264
Number of units - ending balance (in shares)		999,083		1,136,251
Weighted Average Grant Date Fair Value (per Unit)
Weighted average grant date fair value - beginning balance (in dollars per share)		$ 23.78
Granted (in dollars per share)		33.04		$ 38.20	$ 31.38
Weighted average grant date fair value - ending balance (in dollars per share)		$ 25.44		$ 23.78
UGI Performance Units
Number of UGI Units
Granted (in shares)		178,160
Forfeited (in shares)		(17,356)
Vested (in shares)		0
Awards paid (in shares)		(296,687)
Weighted Average Grant Date Fair Value (per Unit)
Granted (in dollars per share)		$ 32.64
Forfeited (in dollars per share)		34.62
Vested (in dollars per share)		0.00
Awards paid (in dollars per share)		$ 25.98
UGI Stock Units
Number of UGI Units
Granted (in shares)		52,493	[1]	39,801	44,814
Awards paid (in shares)		(53,778)
Weighted Average Grant Date Fair Value (per Unit)
Granted (in dollars per share)	[1]	$ 34.39
Awards paid (in dollars per share)		$ 16.86
Shares granted under stock awards (percentage)		70.00%
Vested | UGI Performance Units and Stock Units
Number of UGI Units
Number of units - beginning balance (in shares)		803,817
Number of units - ending balance (in shares)		672,075		803,817
Weighted Average Grant Date Fair Value (per Unit)
Weighted average grant date fair value - beginning balance (in dollars per share)		$ 20.19
Weighted average grant date fair value - ending balance (in dollars per share)		$ 21.17		$ 20.19
Vested | UGI Performance Units
Number of UGI Units
Granted (in shares)		25,291
Forfeited (in shares)		0
Vested (in shares)		154,339
Awards paid (in shares)		(296,687)
Weighted Average Grant Date Fair Value (per Unit)
Granted (in dollars per share)		$ 32.77
Forfeited (in dollars per share)		0.00
Vested (in dollars per share)		28.66
Awards paid (in dollars per share)		$ 25.98
Vested | UGI Stock Units
Number of UGI Units
Granted (in shares)	[1]	39,093
Awards paid (in shares)		(53,778)
Weighted Average Grant Date Fair Value (per Unit)
Granted (in dollars per share)	[1]	$ 33.40
Awards paid (in dollars per share)		$ 16.86
Non-Vested | UGI Performance Units and Stock Units
Number of UGI Units
Number of units - beginning balance (in shares)		332,434
Number of units - ending balance (in shares)		327,008		332,434
Weighted Average Grant Date Fair Value (per Unit)
Weighted average grant date fair value - beginning balance (in dollars per share)		$ 32.28
Weighted average grant date fair value - ending balance (in dollars per share)		$ 34.21		$ 32.28
Non-Vested | UGI Performance Units
Number of UGI Units
Granted (in shares)		152,869
Forfeited (in shares)		(17,356)
Vested (in shares)		154,339
Awards paid (in shares)		0
Weighted Average Grant Date Fair Value (per Unit)
Granted (in dollars per share)		$ 32.62
Forfeited (in dollars per share)		34.62
Vested (in dollars per share)		28.66
Awards paid (in dollars per share)		$ 0.00
Non-Vested | UGI Stock Units
Number of UGI Units
Granted (in shares)	[1]	13,400
Awards paid (in shares)		0
Weighted Average Grant Date Fair Value (per Unit)
Granted (in dollars per share)	[1]	$ 37.29
Awards paid (in dollars per share)		$ 0.00
[1] Generally, shares granted under UGI Stock Unit awards are paid approximately 70% in shares. UGI Stock Unit awards granted in Fiscal 2015 and Fiscal 2014 were 39,801 and 44,814, respectively.

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