STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY - AMOUNTS RECLASSIFIED OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (400)	$ (2,872)	$ 206	$ (6,065)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Income Taxes	(41)	(322)	20	(685)
Amounts reclassified out of accumulated other comprehensive income (loss)	(359)	(2,550)	186	(5,380)
Cost of revenue - product
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(35)	(252)	22	(541)
Cost of revenue - service and support
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(36)	(232)	7	(486)
Research and development, net
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(209)	(1,624)	125	(3,429)
Selling, general and administrative
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (120)	$ (764)	$ 52	$ (1,609)

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph c
-URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph c
-URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959

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