DERIVATIVE FINANCIAL INSTRUMENTS - ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 31, 2018	Jan. 31, 2017
Fair Values of Derivative Financial Instruments
Assets, Fair Value	$ 5,012	$ 3,075
Liabilities, Fair Value	$ 1,308	1,654
Foreign currency forward contracts
Fair Values of Derivative Financial Instruments
Term to maturity of derivative contracts is generally less than this period (in months)	12 months
Derivative, Notional Amount	$ 153,500	144,000
Interest Rate Swap
Fair Values of Derivative Financial Instruments
Derivative, Notional Amount	200,000
Prepaid expenses and other current assets \| Foreign currency forward contracts \| Derivative designated as hedging instruments
Fair Values of Derivative Financial Instruments
Assets, Fair Value	3,682	927
Prepaid expenses and other current assets \| Foreign currency forward contracts \| Derivative not designated as hedging instruments
Fair Values of Derivative Financial Instruments
Assets, Fair Value	0	719
Prepaid expenses and other current assets \| Interest Rate Swap \| Derivative not designated as hedging instruments
Fair Values of Derivative Financial Instruments
Assets, Fair Value	1,330	0
Other assets \| Interest Rate Swap \| Derivative designated as hedging instruments
Fair Values of Derivative Financial Instruments
Assets, Fair Value	0	1,429
Other assets \| Interest Rate Swap \| Derivative not designated as hedging instruments
Fair Values of Derivative Financial Instruments
Assets, Fair Value	1,250	0
Accrued expenses and other current liabilities \| Foreign currency forward contracts \| Derivative designated as hedging instruments
Fair Values of Derivative Financial Instruments
Liabilities, Fair Value	0	288
Accrued expenses and other current liabilities \| Foreign currency forward contracts \| Derivative not designated as hedging instruments
Fair Values of Derivative Financial Instruments
Liabilities, Fair Value	1,061	958
Accrued expenses and other current liabilities \| Interest Rate Swap \| Derivative designated as hedging instruments
Fair Values of Derivative Financial Instruments
Liabilities, Fair Value	0	408
Other liabilities \| Foreign currency forward contracts \| Derivative not designated as hedging instruments
Fair Values of Derivative Financial Instruments
Liabilities, Fair Value	$ 247	$ 0

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

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