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Basis of Presentation (Details) - USD ($) $ in Thousands	Aug. 03, 2019	Apr. 28, 2019	Apr. 27, 2019	Jul. 28, 2018	Apr. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 20,762		$ 35,383	$ 15,915
Restricted cash	339		359	26
Total cash, cash equivalents, and restricted cash shown in the condensed consolidated statement of cash flows	$ 21,101		$ 35,742	$ 15,941	$ 29,755
Operating Lease, Right-of-Use Asset		$ 11,101
Operating Lease, Liability, Current		2,745
Operating Lease, Liability, Noncurrent		$ 8,356