Debt - Schedule of Short-term Debt (Footnotes) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
AmeriGas OLP
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 600,000,000	$ 600,000,000
Energy Services
Short-term Debt [Line Items]
Maximum borrowing capacity	260,000,000	260,000,000
UGI Utilities
Short-term Debt [Line Items]
Maximum borrowing capacity	425,000,000	350,000,000
Mountaineer
Short-term Debt [Line Items]
Maximum borrowing capacity	150,000,000	100,000,000
UGI Corporation
Short-term Debt [Line Items]
Maximum borrowing capacity	300,000,000	300,000,000
Line of Credit | AmeriGas OLP | Letter of Credit | AmeriGas OLP Credit Agreement
Short-term Debt [Line Items]
Maximum borrowing capacity	100,000,000	$ 100,000,000
Line of Credit | Energy Services | Letter of Credit | Energy Services Credit Agreement
Short-term Debt [Line Items]
Maximum borrowing capacity	50,000,000
Line of Credit | UGI Utilities | Letter of Credit | UGI Utilities, Inc. Credit Agreement
Short-term Debt [Line Items]
Maximum borrowing capacity	100,000,000
Line of Credit | Mountaineer | Letter of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	20,000,000
Line of Credit | UGI Corporation | 2021 UGI Corporation Senior Credit Facility
Short-term Debt [Line Items]
Repayment of debt	87,000,000
Line of Credit | UGI Corporation | Letter of Credit | 2021 UGI Corporation Senior Credit Facility
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 10,000,000