Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Thousands											6 Months Ended
	Jan. 28, 2019	Oct. 27, 2018	Oct. 25, 2018	Jun. 30, 2018	May 17, 2018	Jan. 26, 2018	Jul. 02, 2017	Jun. 30, 2017	Jan. 19, 2017	Apr. 01, 2016	Jun. 30, 2018	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018
Regulatory Assets
Proposed negative surcharge in customer distribution service bills, percentage				4.50%							4.50%
Public Utilities, Tax Benefits Received											$ 24,029
Public utilities, civil penalties							$ 2,100
UGI South
Regulatory Assets
PUC termporary rates order, percent of reduction in base revenues					4.71%
UGI North
Regulatory Assets
PUC termporary rates order, percent of reduction in base revenues					2.87%
UGI Central
Regulatory Assets
PUC termporary rates order, percent of reduction in base revenues					6.34%
UGI Utilities
Regulatory Assets
Public utilities, civil penalties							$ 2,100
Pennsylvania Public Utilities Commission
Regulatory Assets
Requested operating revenue increase						$ 9,200
Pennsylvania Public Utilities Commission | UGI Gas
Regulatory Assets
Proposed negative surcharge in customer distribution service bills, percentage	4.50%
Public Utilities, Tax Benefits Received											$ 24,029
Pennsylvania PUC | CPG | Maximum
Regulatory Assets
Distribution system improvement charge, percent of amount billed to customers										0.00%
Pennsylvania PUC | UGI Gas
Regulatory Assets
Requested operating revenue increase	$ 71,090
Pennsylvania PUC | Electric Utilities
Regulatory Assets
Requested operating revenue increase			$ 3,201	$ 7,700					$ 21,700
Tax Cuts And Jobs Act Of 2017, Customer Billing Credit		$ 210
Increase in annual base distribution rate								$ 11,250
Gas Utility
Regulatory Assets
Fair value of unrealized gains (losses)												$ 1,047	$ 2,856	$ 269