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Fair Value of Derivatives as Defined by Accounting Standard (Detail) - USD ($)
$ in Thousands
Apr. 30, 2017
May 01, 2016
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, Assets $ 925  
Other Long-Term Assets    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, Assets 52  
Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivatives designated as cash flow hedges, Liabilities   $ (2,160)
Derivatives not designated as hedging instruments, Liabilities $ (83) $ (287)