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Nature of Business and Summary of Significant Accounting Policies Restricted Cash (Details) - USD ($)
$ in Thousands
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
May 02, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 29,727 $ 32,623    
Restricted cash 28 216    
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 29,755 $ 32,839 $ 28,526 $ 57,780