OTHER COMPREHENSIVE INCOME (LOSS)-AOCI (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ (31,722)	$ (60,481)
Foreign currency translation adjustments [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(13,802)	(32,227)
Pension and other defined benefit plans [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(18,334)	(28,140)
Gain on cash flow hedge [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ 414	$ (114)