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Nature of Business and Summary of Significant Accounting Policies Restricted Cash (Details) - USD ($)
$ in Thousands
May 02, 2020
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 40,398 $ 35,383 $ 29,727  
Restricted cash 14 359 28  
Total cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows $ 40,412 $ 35,742 $ 29,755 $ 32,839