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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
May. 02, 2015
Apr. 26, 2014
Apr. 27, 2013
Income Tax Disclosure [Abstract]      
Deferred tax asset valuation allowance $ 52 $ 2,297  
Undistributed Earnings of Foreign Subsidiaries 10,437    
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, gross 18,315 21,931  
Interest and penalties 14 20 $ 10
Accrued interest or penalties 16 $ 15  
International      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 2,386    
Deferred tax assets, gross $ 800