Debt - Schedule of Long-term Debt (Footnotes) (Details) - USD ($)	Sep. 30, 2019	Aug. 01, 2019	Sep. 30, 2018
AmeriGas Propane | Senior Secured Notes | HOLP Senior Secured Notes
Debt Instrument
Effective interest rate	6.75%		6.75%
UGI International | Term Loan | Variable-rate term loan
Debt Instrument
Effective interest rate	2.04%
UGI France | Term Loan | UGI France Senior Facilities term loan
Debt Instrument
Effective interest rate			1.93%
Flaga | Term Loan | Flaga variable-rate term loan
Debt Instrument
Effective interest rate			1.93%
Flaga | Term Loan | Flaga U.S. dollar variable-rate term loan
Debt Instrument
Effective interest rate			0.55%
Midstream & Marketing | Term Loan | Variable-rate term loan
Debt Instrument
Effective interest rate	5.79%
UGI Utilities | Term Loan | Variable-rate term loan
Debt Instrument
Effective interest rate	3.05%		2.76%
UGI Coporation | Term Loan | 3-year Term loan
Debt Instrument
Effective interest rate	4.30%
Aggregate principal amount		$ 300,000,000
UGI Coporation | Term Loan | 5-year Term Loan
Debt Instrument
Effective interest rate	4.55%
Aggregate principal amount		$ 250,000,000
UGI Coporation | Line of Credit
Debt Instrument
Effective interest rate	4.55%