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Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Thousands
Jul. 29, 2018
Jul. 30, 2017
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, Assets $ 690  
Derivatives not designated as hedging instruments, Assets 5 $ 6
Other Long-Term Assets    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, Assets $ 57  
Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, Liabilities   (704)
Other Long-Term Liabilities    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, Liabilities   $ (90)