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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($)
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Apr. 29, 2012
Income Taxes [Line Items]        
Unrecognized tax benefits $ 14,141,000 $ 13,740,000 $ 13,166,000 $ 12,462,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized 3,800,000 4,000,000    
Gross amount of interest and penalties due to unrecognized tax benefits 844,000 755,000    
Unrecognized tax benefits for which significant change is reasonably possible 14,100,000      
Net Non-current Deferred Income Taxes [Member]        
Income Taxes [Line Items]        
Unrecognized tax benefits 10,300,000 9,700,000    
Income Taxes Payable - Long-Term [Member]        
Income Taxes [Line Items]        
Unrecognized tax benefits $ 3,800,000 $ 4,000,000