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Nature of Business and Summary of Significant Accounting Policies Investment in affiliates (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Equity Method Investments $ 3,647 $ 2,678  
Equity in loss of affiliate 481 136 $ 0
Cost method investments $ 42 $ 42