RETIREMENT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Pension Plan
Net periodic benefit cost:
Service cost	$ 72	$ 65
Interest cost	87	91
Expected return on plan assets	(141)	(112)
Amortization of prior service cost (credit)	1	1
Amortization of net actuarial loss	41	34
Net periodic benefit cost	60	79
Other disclosures
Defined Benefit Plans, Estimated Future Employer Contributions	500
SERP
Net periodic benefit cost:
Service cost	16	16
Interest cost	21	20
Amortization of prior service cost (credit)	(1)	(1)
Amortization of net actuarial loss	9	5
Net periodic benefit cost	45	40
Postretirement Medical
Net periodic benefit cost:
Service cost	0	0
Interest cost	22	14
Amortization of prior service cost (credit)	0	0
Amortization of net actuarial loss	47	0
Net periodic benefit cost	$ 69	$ 14