OTHER EXPENSE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Other Income and Expenses [Abstract]
Foreign currency transaction gain (loss), before tax	$ (118)	$ 217	$ 384	$ (219)
Investment income, net	108	1,266	31	1,261
Net periodic benefit income	$ 787	$ 882	$ 1,574	$ 1,764