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Derivative Instruments (Fair Values of Outstanding Derivative Instruments) (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 22,570	$ 98
Derivative Liabilities	3,135	32,912
Forward Contracts | Not Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	459	79
Forward Contracts | Not Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	20	0
Forward Contracts | Not Designated as Hedging Instrument | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1,446	2,805
Forward Contracts | Not Designated as Hedging Instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	102
Cash Flow Hedging | Forward Contracts | Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	12,076	15
Cash Flow Hedging | Forward Contracts | Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	10,015	4
Cash Flow Hedging | Forward Contracts | Designated as Hedging Instrument | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	983	18,355
Cash Flow Hedging | Forward Contracts | Designated as Hedging Instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 706	$ 11,650

X

- Definition

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

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-Publisher FASB
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-Topic 210
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-Section 55
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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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