ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016
Changes in foreign currency translation
Beginning accumulated foreign currency translation	$ 906	$ 819
Change in cumulative translation adjustment before reclassifications	(70)	(156)
Income taxes	0	0
Net current period other comprehensive loss	(70)	(156)
Ending accumulated foreign currency translation	836	663
Changes in retirement plans
Beginning accumulated retirement plans benefit cost	(4,826)	(2,941)
Amortization of net actuarial loss and prior service cost	97	39
Income taxes	0	0
Net current period other comprehensive income	97	39
Ending accumulated retirement plans benefit cost	(4,729)	(2,902)
Accumulated other comprehensive loss, net of taxes	$ (3,893)	$ (2,239)	$ (3,920)