Basis of Presentation (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020 USD ($)	Aug. 01, 2020 USD ($)	Oct. 31, 2020 USD ($)	May 02, 2020 USD ($)	Nov. 02, 2019 USD ($)	Apr. 27, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 69,836		$ 69,836	$ 40,398	$ 29,265
Restricted cash	3,617		3,617	14	59
Total cash, cash equivalents, and restricted cash shown in the condensed consolidated statement of cash flows	73,453		73,453	$ 40,412	$ 29,324	$ 35,742
Long-term Line of Credit	$ 15,000		$ 15,000
Number of employees, voluntary retirement			60
Voluntary retirement cost		$ 931
Number of employees, reduction in force	150	108
Severance Costs	$ 2,742	$ 1,426
Governmental Wage Subsidy	566	812
Payroll Tax, Employer, Deferral, CARES Act	3,976		$ 3,976
Balance as of May 2, 2020		$ 2,828	2,828
Charged to costs and expenses			1,428
Deductions (1)			(1,040)
Balance as of October 31, 2020	$ 3,216		$ 3,216