Summary of Significant Accounting Policies - Schedule of Other Accruals and Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Summary Of Significant Accounting Policies [Abstract]
Accrued Capital Expenditures	$ 47,344	$ 43,323
Regulatory Liabilities	29,352	38,105
Liability for Royalty and Working Interests	15,007	17,679
Non-Qualified Benefit Plan Liability	14,135	13,052
Other	57,065	48,815
Other Accruals and Current Liabilities	$ 162,903	$ 160,974