RETIREMENT PLANS - NET PERIODIC BENEFIT (INCOME) COST (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Pension Plan
Net periodic benefit (income) cost for the year:
Interest cost	$ 290	$ 258
Expected return on plan assets	(622)	(546)
Amortization of net actuarial loss	0	39
Net periodic benefit (income) cost	(332)	(249)
SERP
Net periodic benefit (income) cost for the year:
Interest cost	60	51
Expected return on plan assets	0	0
Amortization of net actuarial loss	0	0
Net periodic benefit (income) cost	60	51
Post-retirement Medical
Net periodic benefit (income) cost for the year:
Interest cost	0	48
Expected return on plan assets	0	0
Amortization of net actuarial loss	0	62
Net periodic benefit (income) cost	$ 0	$ 110