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Income Taxes - Deferred Income Taxes - Undistributed Earnings from Foreign Subsidiaries - Narrative (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 26, 2014
May 01, 2016
May 03, 2015
Apr. 27, 2014
Income Taxes [Line Items]        
Undistributed earnings from our foreign subsidiaries that will not be reinvested indefinitely   $ 129,600,000 $ 85,200,000  
Deferred tax liability, undistributed earnings from foreign subsidiaries   604,000 1,733,000  
U.S. income and foreign withholding taxes   38,500,000 32,400,000  
U.S. foreign income tax credits   $ 37,900,000 $ 30,700,000  
U.S. Tax Authorities [Member] | Foreign Subsidiaries in China [Member]        
Income Taxes [Line Items]        
U.S. income and foreign withholding taxes $ 4,500,000      
U.S. foreign income tax credits 9,900,000      
Income tax expense (benefit) from income tax effects on undistributed earnings from foreign subsidiaries $ (5,400,000)      
U.S. Tax Authorities [Member] | Foreign Subsidiaries in Canada and China [Member]        
Income Taxes [Line Items]        
Income tax expense (benefit) from income tax effects on undistributed earnings from foreign subsidiaries       $ 352,000