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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 3 Months Ended 12 Months Ended
Oct. 28, 2012
Apr. 28, 2013
Apr. 27, 2014
Apr. 28, 2013
Jan. 26, 2014
U.S. Tax Authorities [Member]
Foreign Subsidiaries in China [Member]
Apr. 27, 2014
U.S. Tax Authorities [Member]
Foreign Subsidiaries in Canada and China [Member]
Income Taxes [Line Items]            
Undistributed earnings from our foreign subsidiaries that will not be reinvested indefinitely $ 55,600,000 $ 56,700,000 $ 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   7,011,000 1,993,000 7,011,000    
U.S. income and foreign withholding taxes     28,100,000 22,000,000 4,500,000  
U.S. foreign income tax credits     26,100,000 15,000,000 9,900,000  
Income tax expense (benefit) from income tax effects on undistributed earnings from foreign subsidiaries         $ 5,400,000 $ 352,000