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Derivatives - Schedule of Fair Value of Derivative Instruments (Detail) - USD ($)
$ in Thousands
Jul. 29, 2018
Apr. 29, 2018
Accrued Expenses [Member] | Cash Flow Hedge [Member] | Foreign Currency Contract [Member] | EURO [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value $ 40 $ 55