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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