Organization - Additional Information $ in Thousands, Person in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2020 USD ($) Store	Oct. 26, 2019 USD ($)	Oct. 31, 2020 USD ($) Person segment Store	Oct. 26, 2019 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of Stores | Store	1,439		1,439
Number of students covered to build relationships and derive sales | Person			6
Number of Reportable Segments | segment			3
Other Nonrecurring Expense | $	$ 0	$ 0	$ 0	$ 433