RETIREMENT PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Pension Plan
Net periodic benefit cost:
Service cost	$ 77	$ 59	$ 128	$ 118
Interest cost	91	84	178	169
Expected return on plan assets	(125)	(105)	(250)	(210)
Amortization of prior service cost (credit)	2	2	3	3
Amortization of net actuarial loss (gain)	22	9	43	18
Net periodic benefit cost	67	49	102	98
Other disclosures
Contribution by the entity to the Pension Plan			250
SERP
Net periodic benefit cost:
Service cost	16	11	31	23
Interest cost	20	17	38	33
Amortization of prior service cost (credit)	(1)	(2)	(2)	(3)
Amortization of net actuarial loss (gain)	6	1	12	2
Net periodic benefit cost	41	27	79	55
Postretirement Medical
Net periodic benefit cost:
Service cost	0	3	0	6
Interest cost	13	14	26	27
Amortization of prior service cost (credit)	0	3	0	6
Amortization of net actuarial loss (gain)	(2)	(5)	(3)	(10)
Net periodic benefit cost	$ 11	$ 15	$ 23	$ 29