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Nature of Business and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Thousands
 12 Months Ended
May. 02, 2015
Apr. 26, 2014
Apr. 27, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Sales returns, reserve $ 15 $ 14  
Deferred revenue period for recognition of product maintenance contracts 10 years    
Percentage of net sales from services 8.20% 8.40% 9.00%