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Basis of Presentation (Details) - USD ($)
$ in Thousands
Jul. 28, 2018
Apr. 28, 2018
Jul. 29, 2017
Apr. 29, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 15,915 $ 29,727 $ 26,868  
Restricted cash 26 28 222  
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 15,941 $ 29,755 $ 27,090 $ 32,839