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Income Taxes - Deferred Income Taxes - Undistributed Earnings from Foreign Subsidiaries - Narrative (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 26, 2014
Oct. 28, 2012
Apr. 28, 2013
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Income Taxes [Line Items]            
Undistributed earnings from our foreign subsidiaries that will not be reinvested indefinitely   $ 55,600,000 $ 56,700,000 $ 85,200,000 $ 72,800,000 $ 56,700,000
Income tax expense (benefit) from change in treatment of undistributed earnings   $ 6,600,000 400,000      
Deferred tax liability, undistributed earnings from foreign subsidiaries     $ 7,000,000 1,733,000 1,993,000 7,000,000
U.S. income and foreign withholding taxes       32,400,000 28,100,000 22,000,000
U.S. foreign income tax credits       30,700,000 26,100,000 $ 15,000,000
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       $ 695,000 $ 352,000