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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($)
$ in Thousands
 12 Months Ended
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Income Taxes [Line Items]      
Current deferred tax asset $ 4,790 $ 6,230  
Non-current deferred tax asset 447 2,040  
Non-current deferred tax liability 1,050 1,013  
U.S. Tax Authorities [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards 32,200 45,700 $ 50,700
Current deferred tax asset 4,400 5,800  
Non-current deferred tax asset   1,400  
Non-current deferred tax liability $ 154    
U.S. Tax Authorities [Member] | Minimum [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards, expiration period 11 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]      
Current deferred tax asset $ 421 372  
Non-current deferred tax asset 447 572  
Canada [Member]      
Income Taxes [Line Items]      
Non-current deferred tax liability $ 896 $ 1,000