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Nature of Business and Summary of Significant Accounting Policies Restricted Cash (Details) - USD ($)
$ in Thousands
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 35,383 $ 29,727 $ 32,623  
Restricted cash 359 28 216  
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows $ 35,742 $ 29,755 $ 32,839 $ 28,526