RETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Net periodic benefit cost:
Interest cost	$ 73	$ 65
Expected return on plan assets	(156)	(137)
Amortization of net actuarial loss	0	10
Net periodic benefit (income) cost	(83)	(62)
Other disclosures
Estimated future Pension Plan contributions	0
SERP
Net periodic benefit cost:
Interest cost	15	13
Expected return on plan assets	0	0
Amortization of net actuarial loss	0	0
Net periodic benefit (income) cost	15	13
Postretirement Medical
Net periodic benefit cost:
Interest cost	0	18
Expected return on plan assets	0	0
Amortization of net actuarial loss	0	23
Net periodic benefit (income) cost	$ 0	$ 41