STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY - AMOUNTS RECLASSIFIED OUT OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Amounts reclassified out of accumulated other comprehensive income (loss)	$ 6,421	$ 1,139
Foreign Exchange Contract
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net	6,813	1,257	$ (8,151)
(Provision) benefit for income taxes	683	118	(1,038)
Amounts reclassified out of accumulated other comprehensive income (loss)	6,130	1,139	(7,113)
Foreign Exchange Contract \| Cost of revenue - product
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net	621	108	(718)
Foreign Exchange Contract \| Cost of revenue - service and support
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net	599	115	(672)
Foreign Exchange Contract \| Research and development, net
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net	3,577	651	(4,556)
Foreign Exchange Contract \| Selling, general and administrative
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net	2,016	383	(2,205)
Interest Rate Swap
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net	680	0	0
(Provision) benefit for income taxes	389	0	0
Amounts reclassified out of accumulated other comprehensive income (loss)	291	0	0
Interest Rate Swap \| Interest expense
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net	(254)	0	0
Interest Rate Swap \| Other income (expense), net
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 934	$ 0	$ 0

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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- Definition

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

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=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
-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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Represents amounts reclassified out of Accumulated Other Comprehensive Income (Loss) into the Statement of Operations.

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