DERIVATIVE FINANCIAL INSTRUMENTS - ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	9 Months Ended
Oct. 31, 2018	Jan. 31, 2018
Fair Values of Derivative Financial Instruments
Assets, Fair Value	$ 6,148	$ 6,262
Liabilities, Fair Value	$ 4,518	1,308
Foreign Exchange Contract
Fair Values of Derivative Financial Instruments
Term to maturity of derivative contracts is generally less than this period (in months)	12 months
Notional amounts of derivative financial instruments	$ 113,100	153,500
Prepaid Expenses and Other Current Assets \| Foreign Exchange Contract \| Derivative designated as hedging instruments
Fair Values of Derivative Financial Instruments
Assets, Fair Value	0	3,682
Prepaid Expenses and Other Current Assets \| Foreign Exchange Contract \| Derivative not designated as hedging instruments
Fair Values of Derivative Financial Instruments
Assets, Fair Value	1,401	0
Prepaid Expenses and Other Current Assets \| Interest rate swap \| Derivative not designated as hedging instruments
Fair Values of Derivative Financial Instruments
Assets, Fair Value	2,869	1,330
Other Assets \| Interest rate swap \| Derivative designated as hedging instruments
Fair Values of Derivative Financial Instruments
Assets, Fair Value	1,878	0
Other Assets \| Interest rate swap \| Derivative not designated as hedging instruments
Fair Values of Derivative Financial Instruments
Assets, Fair Value	0	1,250
Accrued expenses and other current liabilities \| Foreign Exchange Contract \| Derivative designated as hedging instruments
Fair Values of Derivative Financial Instruments
Liabilities, Fair Value	4,518	0
Accrued expenses and other current liabilities \| Foreign Exchange Contract \| Derivative not designated as hedging instruments
Fair Values of Derivative Financial Instruments
Liabilities, Fair Value	0	1,061
Other liabilities \| Foreign Exchange Contract \| Derivative not designated as hedging instruments
Fair Values of Derivative Financial Instruments
Liabilities, Fair Value	$ 0	$ 247

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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Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ 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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Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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