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Investments - Summary of Sales of Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 25, 2020	Apr. 27, 2019	Apr. 28, 2018
Sales of marketable securities
Proceeds from sales	$ 36,443	$ 20,944	$ 22,674
Gross realized gains	852	1,152	1,302
Gross realized losses	(159)	$ (496)	$ (532)
Fair value of available-for-sale securities by contractual maturity
Within one year	18,684
Within two to five years	8,070
Within six to ten years	1,256
Within six to ten years	2,203
Total	$ 30,213

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