Investments - Schedule of Sales of Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 27, 2024	Apr. 29, 2023	Apr. 30, 2022
Sales of marketable securities
Proceeds from sales	$ 23,328	$ 24,483	$ 35,116
Gross realized gains	1,967	94	879
Gross realized losses	(768)	$ (242)	$ (402)
Fair value of available-for-sale securities by contractual maturity
Within one year	5,495
Securities not due at a single maturity date	6,520
Total	$ 12,015

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