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Nature of Business and Summary of Significant Accounting Policies - Advertising Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2016
May 02, 2015
Apr. 26, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Advertising expense $ 2,209 $ 2,318 $ 1,694