OTHER INCOME (EXPENSE) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Income and Expenses [Abstract]
Foreign currency transaction gain (loss), before tax	$ 72	$ 150	$ 441	$ 535
Net periodic benefit income	392	787	1,170	2,361
Investment income, net	$ 294	$ (14)	145	$ 18
Contract award income			$ 700