ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Changes in foreign currency translation
Beginning accumulated foreign currency translation	$ 663	$ 1,285	$ 819	$ 1,692
Change in cumulative translation adjustment before reclassifications	272	(918)	116	(1,325)
Amounts reclassified from accumulated other comprehensive income	0	146	0	146
Income taxes	0	0	0	0
Net current period other comprehensive income (loss)	272	(772)	116	(1,179)
Ending accumulated foreign currency translation	935	513	935	513
Changes in retirement plans
Beginning accumulated retirement plans benefit cost	(2,902)	(1,924)	(2,941)	(1,950)
Amortization of net actuarial loss and prior service cost	38	27	77	53
Income taxes	0	0	0	0
Net current period other comprehensive income	38	27	77	53
Ending accumulated retirement plans benefit cost	(2,864)	(1,897)	(2,864)	(1,897)
Accumulated other comprehensive loss, net of taxes	$ (1,929)	$ (1,384)	$ (1,929)	$ (1,384)	$ (2,122)