ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Foreign currency translation:
Balance at beginning of period	$ 906	$ 819
Change in cumulative translation adjustment before reclassifications	147	87
Income taxes	0	0
Net current period other comprehensive income	147	87
Balance at end of the period	1,053	906
Retirement plans:
Balance at beginning of period	(4,826)	(2,941)
Amortization of net actuarial loss and prior service cost	326	168
Net actuarial gain (loss) arising during the period	2,389	(2,053)
Income taxes	0	0
Net current period other comprehensive income (loss)	2,715	(1,885)
Balance at end of the period	(2,111)	(4,826)
Accumulated other comprehensive loss, net of taxes	$ (1,058)	$ (3,920)