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Derivative Instruments - Fair Values of Outstanding Derivative Instruments (Detail) - USD ($)
$ in Thousands
Oct. 31, 2018
Jan. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 36,416 $ 98
Derivative Liabilities 540 32,912
Forward Contracts | Designated as Hedging Instrument | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 18,417 15
Forward Contracts | Designated as Hedging Instrument | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 16,481 4
Forward Contracts | Designated as Hedging Instrument | Accrued expenses and other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 213 18,355
Forward Contracts | Designated as Hedging Instrument | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 10 11,650
Forward Contracts | Not Designated as Hedging Instrument | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 1,445 79
Forward Contracts | Not Designated as Hedging Instrument | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 73 0
Forward Contracts | Not Designated as Hedging Instrument | Accrued expenses and other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 317 2,805
Forward Contracts | Not Designated as Hedging Instrument | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 0 $ 102