Equity - Narrative (Details) - USD ($)				12 Months Ended
	Jun. 01, 2024	Feb. 02, 2022	May 25, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	May 17, 2021
Class of Stock [Line Items]
Repurchases of common stock						$ 0
Preferred Stock, shares authorized (in shares)				5,000,000	5,000,000
UGI Series Preference Stock outstanding (in shares)				0
Shares issued on conversion settlement (in shares)			1
Sale price (in dollars per share)							$ 43.81
Quarterly contract adjustment payments liability			$ 45,000,000
2024 Purchase Contracts
Class of Stock [Line Items]
Contract redemption obligation			$ 100,000,000
Maximum settlement rate			2.2826
Number of common stock deliverable percentage			85.00%
Quarterly contract adjustment payments percentage			7.125%
2024 Purchase Contracts | Forecast
Class of Stock [Line Items]
Contract redemption obligation	$ 100,000,000
Common Stock
Class of Stock [Line Items]
Maximum number of shares authorized for repurchase (up to) (in shares)		8,000,000
Stock repurchase program period		4 years
Repurchases of common stock (in shares)				600,000	900,000	0
Repurchases of common stock				$ 22,000,000	$ 38,000,000
Corporate Units | Preferred stock, without par value
Class of Stock [Line Items]
Units and shares sold (in shares)			2,200,000
Notional value			$ 220,000,000
Stated value (in dollars per share)			$ 100
Undivided beneficial ownership interest			10.00%
Liquidation preference (in dollars per share)			$ 1,000
Issuance of Preferred Stock, net of issuance costs			$ 213,000,000
Convertible Preferred Stock
Class of Stock [Line Items]
Liquidation preference (in dollars per share)			$ 1,000
Dividend rate			0.125%
Shares issued on conversion (in shares)			19.0215
Stock conversion price (in dollars per share)			$ 52.57
Convertible Preferred Stock | Preferred stock, without par value
Class of Stock [Line Items]
Units and shares sold (in shares)			220,000
Series B preferred stock
Class of Stock [Line Items]
Preferred Stock, shares authorized (in shares)				220,000	220,000	220,000