OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Pre-tax
Foreign currency translation adjustments	$ 13,683	$ (30,384)	$ 10,334	$ (45,884)
Pension and other defined benefit plans	595	545	1,189	1,090
Cash flow hedges	(2,355)	(91)	(3,805)	(204)
Available-for-sale securities	0	145	0	(1,370)
Total other comprehensive income (loss)	11,923	(29,785)	7,718	(46,368)
Tax
Pension and other defined benefit plans	(209)	(192)	(417)	(384)
Cash flow hedges	706	11	1,141	50
Available-for-sale securities	0	(53)	0	500
Total other comprehensive income (loss)	497	(234)	724	166
Net of tax
Foreign currency translation adjustments	13,683	(30,384)	10,334	(45,884)
Pension and other defined benefit plans	386	353	772	706
Cash flow hedges	(1,649)	(80)	(2,664)	(154)
Available-for-sale securities	0	92	0	(870)
Total other comprehensive income (loss), net of taxes	$ 12,420	$ (30,019)	$ 8,442	$ (46,202)

Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.