Debt - Schedule of Long-term Debt (Footnotes) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Midstream & Marketing
Debt Instrument [Line Items]
Fixed rate (as a percentage)	4.53%
UGI International
Debt Instrument [Line Items]
Fixed rate (as a percentage)	3.10%
UGI Corporation | 3-year Term loan
Debt Instrument [Line Items]
Fixed rate (as a percentage)	3.61%
UGI Corporation | 7-Year Term Loan
Debt Instrument [Line Items]
Fixed rate (as a percentage)	3.61%
Line of Credit | UGI Corporation
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	7.45%	7.80%
Mountaineer senior notes | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Principal amount	$ 180,000,000	$ 180,000,000
Unamortized premium	$ 16,000,000	$ 19,000,000
Mountaineer senior notes | Senior Notes | UGI Utilities, Inc. | Minimum
Debt Instrument [Line Items]
Interest rate (as a percentage)	3.50%
Mountaineer senior notes | Senior Notes | UGI Utilities, Inc. | Maximum
Debt Instrument [Line Items]
Interest rate (as a percentage)	4.49%
Variable-rate term loan | Term Loan | UGI Utilities, Inc.
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	3.92%	3.92%
Fixed rate (as a percentage)	2.82%
Quarterly installments	$ 2,000,000
Variable-rate term loan | Term Loan | Midstream & Marketing
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	7.09%	7.82%
Quarterly installments	$ 2,000,000
Variable-rate term loan | Term Loan Due March 2028 | UGI International
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	4.95%
3-year Term loan | Term Loan | UGI Corporation
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	6.09%	2.77%
5-year Term Loan | Term Loan | UGI Corporation
Debt Instrument [Line Items]
Effective interest rate (as a percentage)		7.79%
7-Year Term Loan | Term Loan | UGI Corporation
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	6.75%	4.73%