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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($)
$ in Thousands
 12 Months Ended
May 01, 2016
May 03, 2015
Income Taxes [Line Items]    
Non-current deferred income tax asset $ 2,319 $ 5,169
Non-current deferred income tax liability 1,483 982
U.S. Tax Authorities [Member]    
Income Taxes [Line Items]    
Operating loss carryforwards 18,000  
Operating loss carryforwards, related future tax benefits $ 6,900  
U.S. foreign income tax credits, expiration period 10 years  
U.S. foreign income tax credits, expiration fiscal year 2026  
Non-current deferred income tax asset $ 1,700 4,300
U.S. Tax Authorities [Member] | Minimum [Member]    
Income Taxes [Line Items]    
Operating loss carryforwards, expiration period 10 years  
U.S. Tax Authorities [Member] | Maximum [Member]    
Income Taxes [Line Items]    
Operating loss carryforwards, expiration period 19 years  
China [Member]    
Income Taxes [Line Items]    
Non-current deferred income tax asset $ 572 868
Canada [Member]    
Income Taxes [Line Items]    
Non-current deferred income tax liability $ 1,483 $ 982