OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Pre-tax
Foreign currency translation adjustments	$ 6,414	$ 796	$ 1,344	$ 11,130
Pension and other defined benefit plans	836	593	2,508	1,782
Cash flow hedges	277	1,838	1,121	(1,967)
Total other comprehensive income (loss)	7,527	3,227	4,973	10,945
Tax
Pension and other defined benefit plans	(292)	(207)	(876)	(624)
Cash flow hedges	(79)	(551)	(320)	590
Total other comprehensive income (loss)	(371)	(758)	(1,196)	(34)
Net of tax
Foreign currency translation adjustments	6,414	796	1,344	11,130
Pension and other defined benefit plans	544	386	1,632	1,158
Cash flow hedges	198	1,287	801	(1,377)
Total other comprehensive income (loss), net of taxes	$ 7,156	$ 2,469	$ 3,777	$ 10,911