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Nature of Business and Summary of Significant Accounting Policies Investment in affiliates (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
May 02, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Equity Method Investments $ 2,678 $ 0  
Income (Loss) from Equity Method Investments 136 0 $ 0
Cost method investments $ 42 $ 1,211