OTHER INCOME (EXPENSE) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Other Income and Expenses [Abstract]
Other income (expense)	$ 1,445	$ 3,127	$ 4,880
Currency exchange gains (losses)	(915)	(438)	(200)
Investment income (loss)	184	(40)	1,184
Net periodic benefit cost (credit)	(1,559)	$ (3,148)	$ (3,649)
Technology recognition award	$ 700