CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenues	$ 1,932.0	$ 2,007.0
Costs and expenses:
Cost of sales (excluding depreciation and amortization shown below)	833.0	1,008.0
Operating and administrative expenses	489.0	511.0
Depreciation and amortization	124.0	119.0
Other operating income, net	(16.0)	(8.0)
Costs and expenses	1,430.0	1,630.0
Operating income	502.0	377.0
Income from equity investees	7.0	7.0
Other non-operating expense, net	(19.0)	(12.0)
Interest expense	(78.0)	(84.0)
Income before income taxes	412.0	288.0
Income tax expense	(109.0)	(76.0)
Net income attributable to UGI Corporation	$ 303.0	$ 212.0
Earnings per common share attributable to UGI Corporation stockholders:
Basic (in USD per share)	$ 1.45	$ 1.01
Diluted (in USD per share)	$ 1.44	$ 1.00
Weighted-average common shares outstanding (thousands):
Basic (in shares)	208,774	209,439
Diluted (in shares)	209,640	211,258