Asset Retirement Obligations (Tables)

12 Months Ended

Sep. 30, 2023

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
	2023		2022		2021
	(Thousands)
Balance at Beginning of Year	$	161,545	$	209,639	$	192,228
Liabilities Incurred	3,313		2,401		7,035
Revisions of Estimates	6,728		10,700		14,509
Liabilities Settled	(14,448)		(71,171)		(14,270)
Accretion Expense	8,354		9,976		10,137
Balance at End of Year	$	165,492	$	161,545	$	209,639