Equity-Based Compensation - UGI Unit Award Activity (Details)	12 Months Ended
	Sep. 30, 2018 $ / shares shares
UGI Units
Beginning balance (in units)	52,224
Granted (in units)	17,050
Performance criteria not net (in units)	(4,456)
Unit awards paid (in units)	12,377
Ending balance (in units)	52,441
Weighted-Average Grant-Date Fair Value (per Unit)
Beginning balance (in usd per share) | $ / shares	$ 40.72
Granted (in usd per share) | $ / shares	53.90
Performance criteria not met (in usd per share) | $ / shares	38.69
Unit awards paid (in usd per share) | $ / shares	38.54
Ending balance (in usd per share) | $ / shares	$ 45.69
Vested
UGI Units
Beginning balance (in units)	6,636
Ending balance (in units)	9,056