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Organization and Significant Accounting Policies - Contract Estimates (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 30, 2021 USD ($) contract	Jan. 25, 2020 USD ($) contract	Jan. 30, 2021 USD ($) contract	Jan. 25, 2020 USD ($) contract
Material adjustment to any one contract	$ 0	$ 0	$ 0	$ 0
Amount of revised aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods		$ 1,152		$ 1,169
Number of active contracts \| contract	1	1	1	1
Revision of estimate of total costs required to complete the contracts
Amount of revised aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods				$ 1,036