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Income Taxes - Narrative (Details) (USD $)
 12 Months Ended
Apr. 26, 2014
Apr. 27, 2013
Apr. 28, 2012
Income Tax Disclosure [Abstract]      
Research tax credits $ 750,000 $ 1,804,000 $ 1,004,000
Change in foreign deferred rates 0 0 249,000
Deferred tax asset valuation allowance 2,297,000 0  
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, gross 21,931,000 22,188,000  
Interest and penalties 20,000 10,000 (1,000)
Accrued interest or penalties 15,000 11,000  
International
      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 2,300,000    
Deferred tax assets, gross $ 766,000 $ 0