RETIREMENT PLANS - NET PERIODIC BENEFIT (INCOME) COST (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Pension Plan
Net periodic benefit (income) cost for the year:
Interest cost	$ 406	$ 290
Expected return on plan assets	(667)	(622)
Amortization of net actuarial gain	0	0
Net periodic benefit (income) cost	(261)	(332)
SERP
Net periodic benefit (income) cost for the year:
Interest cost	88	60
Expected return on plan assets	0	0
Amortization of net actuarial gain	(79)	0
Net periodic benefit (income) cost	$ 9	$ 60