STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY - AMOUNTS RECLASSIFIED OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Amounts reclassified out of accumulated other comprehensive income (loss)			$ (882)
Foreign Exchange Contract
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (1,413)	$ 1,953	(980)	$ 2,874
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Income Taxes	(141)	195	(98)	287
Amounts reclassified out of accumulated other comprehensive income (loss)	(1,272)	1,758	(882)	2,587
Foreign Exchange Contract \| 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	(125)	180	(88)	266
Foreign Exchange Contract \| 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	(134)	158	(94)	233
Foreign Exchange Contract \| 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	(712)	1,033	(492)	1,515
Foreign Exchange Contract \| 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	(442)	582	(306)	860
Interest rate swap
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	858	0	680
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Income Taxes	0	389	0	389
Amounts reclassified out of accumulated other comprehensive income (loss)	0	469	0	291
Interest rate swap \| Interest Expense [Member]
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	(76)	0	(254)
Interest rate swap \| Other income (expense), net
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, gains (losses) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 0	$ 934	$ 0	$ 934

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=84234895&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=84234895&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=84228862&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=84234895&loc=d3e41638-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84228862&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=84228862&loc=d3e640-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959

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