Leases - Components of Operating Lease Costs (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023
Lessee, Lease, Description [Line Items]
Operating Lease Expense		$ 11,827	$ 7,484
Variable Lease Expense	[1]	601	507
Short-Term Lease Expense/Costs	[2]	299	1,694
Total Lease Expense		12,727	9,685
Exploration and Production Properties
Lessee, Lease, Description [Line Items]
Lease Costs Recorded to Property, Plant and Equipment	[3]	$ 20,143	$ 24,018

[1] Variable lease payments that are not dependent on an index or rate are not included in the lease liability.

[2] Short-term lease costs exclude expenses related to leases with a lease term of one month or less.

[3] Lease costs relating to drilling rig leases that are capitalized as part of exploration and production properties under full cost pool accounting as well as certain equipment leases used on construction projects.