Debt - Schedule of Long-term Debt (Footnotes) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
AmeriGas Propane | Senior Secured Notes | HOLP Senior Secured Notes
Debt Instrument [Line Items]
Effective interest rate (as a percentage)		6.75%
UGI International | Term Loan | Variable-rate term loan
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	2.04%	2.04%
Midstream & Marketing | Term Loan | Variable-rate term loan
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	5.30%	5.79%
Quarterly Installments	$ 2,000,000
UGI Utilities | Term Loan | Variable-rate term loan
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	4.00%	3.05%
Quarterly Installments	$ 2,000,000
UGI Coporation | Term Loan | 3-year Term loan
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	3.51%	4.30%
UGI Coporation | Term Loan | 5-year Term Loan
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	3.50%	4.55%
Quarterly Installments	$ 9,000,000
UGI Coporation | Line of Credit
Debt Instrument [Line Items]
Effective interest rate (as a percentage)	2.41%	4.55%