RETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other disclosures
Gain on termination of post-retirement medical plan	$ 0	$ 2,341	$ 0	$ 2,341
Pension Plan
Net periodic benefit cost:
Interest cost	73	64	218	193
Expected return on plan assets	(156)	(136)	(467)	(410)
Amortization of net actuarial loss	0	10	0	30
Net periodic benefit (income) cost	(83)	(62)	(249)	(187)
Other disclosures
Estimated future Pension Plan contributions	0		0
SERP
Net periodic benefit cost:
Interest cost	15	13	45	39
Expected return on plan assets	0	0	0	0
Amortization of net actuarial loss	0	0	0	0
Net periodic benefit (income) cost	15	13	45	39
Post-retirement Medical
Net periodic benefit cost:
Interest cost	0	12	0	48
Expected return on plan assets	0	0	0	0
Amortization of net actuarial loss	0	16	0	62
Net periodic benefit (income) cost	$ 0	28	0	110
Other disclosures
Gain on termination of post-retirement medical plan		$ 2,341	$ 0	$ 2,341