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Basis of Presentation (Details) - USD ($)
$ in Thousands
Oct. 27, 2018
Apr. 28, 2018
Oct. 28, 2017
Apr. 29, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 35,557 $ 29,727 $ 39,699  
Restricted cash 26 28 27  
Total cash, cash equivalents, and restricted cash shown in the condensed consolidated statements of cash flows $ 35,583 $ 29,755 $ 39,726 $ 32,839