Commitments and Contingencies (Details)	9 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) subsidiary	Sep. 30, 2017 USD ($) record_of_decision	Mar. 24, 2023 person	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)
Loss Contingencies
Environmental expenditures cap during calendar year	$ 5,000,000
West Reading, Pennsylvania Explosion
Loss Contingencies
Number of fatalities | person			7
Number of injuries | person			11
MGP sites in Pennsylvania
Loss Contingencies
Accrual for environmental loss contingencies	$ 52,000,000			$ 53,000,000	$ 51,000,000
Utilities
Loss Contingencies
Number of subsidiaries acquired with similar histories | subsidiary	2
AmeriGas OLP | Saranac Lake, New York | NYDEC ROD
Loss Contingencies
Accrual for environmental loss contingencies	$ 8,000,000
Loss contingency, number of remediation plans | record_of_decision		3
Estimated remediation plan cost		$ 28,000,000