OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Pre-tax
Foreign currency translation adjustments	$ (13,479)	$ (3,349)
Pension and other defined benefit plans	836	594
Cash flow hedges	2,272	(1,450)
Total other comprehensive income (loss)	(10,371)	(4,205)
Tax
Pension and other defined benefit plans	(292)	(208)
Cash flow hedges	(649)	435
Total other comprehensive income (loss)	(941)	227
Net of tax
Foreign currency translation adjustments	(13,479)	(3,349)
Pension and other defined benefit plans	544	386
Cash flow hedges	1,623	(1,015)
Total other comprehensive income (loss), net of taxes	$ (11,312)	$ (3,978)