RETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Pension Plan
Net periodic benefit cost:
Service cost	$ 65	$ 77	$ 130	$ 128
Interest cost	91	91	182	178
Expected return on plan assets	(112)	(125)	(224)	(250)
Amortization of prior service cost (credit)	1	2	2	3
Amortization of net actuarial loss (gain)	34	22	68	43
Net periodic benefit cost	79	67	158	102
Other disclosures
Contribution by the entity to the Pension Plan			350
Estimated future employer contributions			750
SERP
Net periodic benefit cost:
Service cost	16	16	32	31
Interest cost	20	20	40	38
Amortization of prior service cost (credit)	(1)	(1)	(2)	(2)
Amortization of net actuarial loss (gain)	4	6	9	12
Net periodic benefit cost	39	41	79	79
Postretirement Medical
Net periodic benefit cost:
Service cost	0	0	0	0
Interest cost	14	13	28	26
Amortization of prior service cost (credit)	0	0	0	0
Amortization of net actuarial loss (gain)	0	(2)	0	(3)
Net periodic benefit cost	$ 14	$ 11	$ 28	$ 23