OTHER EXPENSE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Foreign currency transaction gain (loss), before tax	$ 217	$ (291)	$ (219)	$ (423)
Investment income, net	$ 1,266	$ 68	$ 1,261	$ 155