Leases - Components of Operating Lease Costs (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Lessee, Lease, Description [Line Items]
Operating Lease Expense		$ 7,484	$ 4,909
Variable Lease Expense	[1]	507	462
Short-Term Lease Expense/Costs	[2]	1,694	461
Sublease Income		0	(166)
Total Lease Expense		9,685	5,666
Oil and Natural Gas Properties
Lessee, Lease, Description [Line Items]
Lease Costs Recorded to Property, Plant and Equipment	[3]	$ 24,018	$ 19,839

[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 oil and natural gas properties under full cost pool accounting as well as certain equipment leases used on construction projects.