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Foreign Currency Forward Contracts Outstanding with Notional Values (Detail) - Foreign Exchange Contract - Cash Flow Hedging - USD ($)
$ in Thousands
Aug. 04, 2019
Jul. 29, 2018
Derivatives designated as hedging instruments    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Exchange of foreign currency contracts $ 6,000 $ 20,800
Not Designated as Hedging Instrument    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Exchange of foreign currency contracts   $ 6,600