INCOME TAXES - COMPONENTS OF INCOME TAX PROVISION (BENEFIT) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Current:
Federal	$ 691	$ 13,393	$ 4,238
State	(682)	7,716	2,104
Deferred:
Federal	66,623	36,825	55,968
State	18,531	(8,381)	14,185
Investment/production tax credits	(257)	(278)	(300)
Income tax provision	$ 84,906	$ 49,275	$ 76,195