Inventories - Narrative (Details) - UGI Utilities $ in Millions	12 Months Ended
	Sep. 30, 2019 storage_agreement	Sep. 30, 2018 USD ($) Bcf
Public Utilities, Inventory
Number of storage agreements | storage_agreement	4
Storage agreement term (up to)	3 years
Volume of gas storage inventories released under SCAAs with non-affiliates (in cubic feet) | Bcf		2.3
Carrying value of gas storage inventories released under SCAAs with non-affiliates | $		$ 5.4