ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Changes in foreign currency translation
Beginning accumulated foreign currency translation	$ 858	$ 935	$ 906	$ 819
Change in cumulative translation adjustment before reclassifications	81	(3)	33	113
Income taxes	0	0	0	0
Net current period other comprehensive income (loss)	81	(3)	33	113
Ending accumulated foreign currency translation	939	932	939	932
Changes in retirement plans
Beginning accumulated retirement plans benefit cost	(4,633)	(2,864)	(4,826)	(2,941)
Amortization of net actuarial loss and prior service cost	51	50	244	127
Income taxes	0	0	0	0
Net current period other comprehensive income	51	50	244	127
Ending accumulated retirement plans benefit cost	(4,582)	(2,814)	(4,582)	(2,814)
Accumulated other comprehensive loss, net of taxes	$ (3,643)	$ (1,882)	$ (3,643)	$ (1,882)	$ (3,920)