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Nature of Business and Summary of Significant Accounting Policies Advertising Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Advertising expense $ 2,855 $ 2,125 $ 2,209