Asset Retirement Obligations (Tables)

12 Months Ended

Sep. 30, 2025

Asset Retirement Obligation [Abstract]

Schedule of Change in Asset Retirement Obligation

The following is a reconciliation of the change in the Company’s asset retirement obligations:

	Year Ended September 30
	2025		2024		2023
	(Thousands)
Balance at Beginning of Year	$	203,006	$	165,492	$	161,545
Liabilities Incurred	5,210		2,367		3,313
Revisions of Estimates	56,570		51,967		6,728
Liabilities Settled	(38,862)		(25,556)		(14,448)
Accretion Expense	10,863		8,736		8,354
Balance at End of Year	$	236,787	$	203,006	$	165,492