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Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Thousands
Aug. 04, 2019
Jul. 29, 2018
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, Assets $ 142 $ 690
Derivatives not designated as hedging instruments, Assets 5
Other Long-Term Assets    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, Assets $ 57