RETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Pension Plan
Net periodic benefit cost:
Service cost	$ 34	$ 65	$ 178	$ 195
Interest cost	78	91	252	273
Expected return on plan assets	(122)	(139)	(404)	(363)
Amortization of prior service cost (credit)	2	2	4	4
Amortization of net actuarial loss	21	38	103	106
Net periodic benefit cost	13	57	133	215
Other disclosures
Contribution by the entity to the Pension Plan			350
Estimated future employer contributions			350
SERP
Net periodic benefit cost:
Service cost	(5)	19	26	51
Interest cost	1	24	42	64
Amortization of prior service cost (credit)	(2)	(2)	(4)	(4)
Amortization of net actuarial loss	(17)	12	0	21
Net periodic benefit cost	(23)	53	64	132
Postretirement Medical
Net periodic benefit cost:
Service cost	0	0	0	0
Interest cost	22	14	66	42
Amortization of prior service cost (credit)	0	0	0	0
Amortization of net actuarial loss	47	0	141	0
Net periodic benefit cost	$ 69	$ 14	$ 207	$ 42