Equity - Common Stock Share Activity (Details) - shares	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance - shares Issued (in shares)	220,000	220,000	0
UGI Series Preference Stock outstanding (in shares)	0
Shares issued - beginning balance (in shares)	210,560,494
Ending balance - shares Issued (in shares)	220,000	220,000	220,000
Ending balance - shares outstanding (in shares)	0	0
Shares issued - ending balance (in shares)	210,906,052	210,560,494
Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
UGI Series Preference Stock outstanding (in shares)	220,000	220,000	0
Equity Unit offering (in shares)			220,000
Ending balance - shares Issued (in shares)	220,000
Ending balance - shares outstanding (in shares)	220,000	220,000	220,000
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued - beginning balance (in shares)	210,560,494	209,843,296	209,514,044
Beginning balance - shares Outstanding (in shares)	209,582,212	209,216,135	208,354,438
Employee and director plans - shares Issued/Treasury (in shares)	345,558	717,198	329,252
Employee and director plans - shares Outstanding (in shares)	512,871	1,516,350	883,567
Repurchases of common stock - Treasury (in shares)	(600,000)	(900,000)	0
Reacquired common stock – employee and director plans (in shares)		(250,273)	(21,870)
Shares issued - ending balance (in shares)	210,906,052	210,560,494	209,843,296
Ending balance - shares Outstanding (in shares)	209,495,083	209,582,212	209,216,135
Common Stock | Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance - treasury shares (in shares)	(978,282)	(627,161)	(1,159,606)
Employee and director plans - shares Issued/Treasury (in shares)	167,313	799,152	554,315
Repurchases of common stock - Treasury (in shares)	(600,000)	(900,000)
Reacquired common stock – employee and director plans (in shares)		(250,273)	(21,870)
Ending balance - treasury shares (in shares)	(1,410,969)	(978,282)	(627,161)