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Derivative Instruments - Fair Values of Outstanding Derivative Instruments (Detail) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 35,238	$ 22,570
Derivative Liabilities	752	3,135
Forward Contracts | Not Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	1,685	459
Forward Contracts | Not Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	78	20
Forward Contracts | Not Designated as Hedging Instrument | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	314	1,446
Forward Contracts | Not Designated as Hedging Instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	9	0
Cash Flow Hedging | Forward Contracts | Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	18,172	12,076
Cash Flow Hedging | Forward Contracts | Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	15,303	10,015
Cash Flow Hedging | Forward Contracts | Designated as Hedging Instrument | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	154	983
Cash Flow Hedging | Forward Contracts | Designated as Hedging Instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 275	$ 706

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
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 860
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