RETIREMENT PLANS - NET PERIODIC BENEFIT (INCOME) COST (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Pension Plan
Net periodic benefit (income) cost for the year:
Interest cost	$ 411	$ 406
Expected return on plan assets	(766)	(667)
Amortization of net actuarial gain	0	0
Net periodic benefit (income) cost	(355)	(261)
SERP
Net periodic benefit (income) cost for the year:
Interest cost	95	88
Expected return on plan assets	0	0
Amortization of net actuarial gain	(85)	(79)
Net periodic benefit (income) cost	$ 10	$ 9