OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Pre-tax
Foreign currency translation adjustments	$ (30,384)	$ 1,224	$ (45,884)	$ (1,913)
Pension and other defined benefit plans	545	1,698	1,090	2,191
Loss on cash flow hedge	(91)	0	(204)	0
Available-for-sale securities	145	0	(1,370)	0
Total other comprehensive income (loss)	(29,785)	2,922	(46,368)	278
Tax
Pension and other defined benefit plans	(192)	(599)	(384)	(776)
Loss on cash flow hedge	11	0	50	0
Available-for-sale securities	(53)	0	500	0
Total other comprehensive income (loss)	(234)	(599)	166	(776)
Net of tax
Foreign currency translation adjustments	(30,384)	1,224	(45,884)	(1,913)
Pension and other defined benefit plans	353	1,099	706	1,415
Loss on cash flow hedge	(80)	0	(154)	0
Available-for-sale securities	92	0	(870)	0
Total other comprehensive income (loss), net of taxes	$ (30,019)	$ 2,323	$ (46,202)	$ (498)