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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 24, 2021	Jul. 25, 2020
Sales of marketable securities
Proceeds from sales	$ 9,715	$ 13,725
Gross realized gains	267	126
Gross realized losses	(11)	$ (18)
Fair value of available-for-sale securities by contractual maturity
Within one year	17,506
Within two to five years	15,351
Within six to ten years	1,316
Thereafter	1,694
Total	$ 35,867

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