Technology Partner Innovations, LLC ("TPI") (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 24, 2021	Jan. 23, 2021	Oct. 24, 2020	Jul. 25, 2020	Apr. 25, 2020	Jan. 25, 2020	Oct. 26, 2019	Jul. 27, 2019	Apr. 24, 2021	Apr. 25, 2020	Apr. 27, 2019
Business Acquisition [Line Items]
Net loss attributable to noncontrolling interest	$ 241	$ 192	$ 234	$ 205	$ 211	$ 255	$ 220	$ 235	$ 872	$ 921	$ 752
Noncontrolling interest	1,455				$ 2,327				1,455	2,327
Technology Partner Innovations, LLC
Business Acquisition [Line Items]
Net assets contributed										4,000
Net loss attributable to noncontrolling interest									872	$ 921
Noncontrolling interest	$ 1,455								$ 1,455