OTHER COMPREHENSIVE INCOME (LOSS)-AOCI (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ (36,682)	$ (34,112)
Foreign currency translation adjustments [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(25,675)	(22,824)
Pension and other defined benefit plans [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(11,391)	(11,759)
Gain on cash flow hedge [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ 384	$ 471