Inventories - Narrative (Details) - UGI Utilities	6 Months Ended
	Mar. 31, 2019 storage_agreement	Sep. 30, 2018 USD ($) Bcf	Mar. 31, 2018 USD ($)
Inventory
Number of storage agreements | storage_agreement	5
Volume of gas storage inventories released under SCAAs with non-affiliates (in bcf) | Bcf		2.3
Carrying value of gas storage inventories released under SCAAs with non-affiliates | $		$ 5,400,000	$ 0
Maximum
Inventory
SCAA contract term (in years)	3 years