RETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pension Plan
Net periodic benefit cost:
Service cost	$ 65	$ 64	$ 195	$ 192
Interest cost	91	89	273	267
Expected return on plan assets	(139)	(125)	(363)	(375)
Amortization of prior service cost (credit)	2	1	4	4
Amortization of net actuarial loss (gain)	38	21	106	64
Net periodic benefit cost	57	50	215	152
Other disclosures
Contribution by the entity to the Pension Plan			1,100
Estimated future employer contributions			0
SERP
Net periodic benefit cost:
Service cost	19	15	51	46
Interest cost	24	19	64	57
Amortization of prior service cost (credit)	(2)	(1)	(4)	(3)
Amortization of net actuarial loss (gain)	12	6	21	18
Net periodic benefit cost	53	39	132	118
Postretirement Medical
Net periodic benefit cost:
Service cost	0	0	0	0
Interest cost	14	13	42	39
Amortization of prior service cost (credit)	0	0	0	0
Amortization of net actuarial loss (gain)	0	(1)	0	(4)
Net periodic benefit cost	$ 14	$ 12	$ 42	$ 35