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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 22, 2022	Jan. 23, 2021	Jan. 22, 2022	Jan. 23, 2021
Sales of marketable securities
Proceeds from sales	$ 7,784	$ 6,807	$ 29,437	$ 23,824
Gross realized gains	142	169	696	479
Gross realized losses	(20)	$ (15)	(356)	$ (41)
Fair value of available-for-sale securities by contractual maturity
Within one year	14,832		14,832
Within two to five years	16,341		16,341
Within six to ten years	967		967
Thereafter	1,640		1,640
Total	$ 33,780		$ 33,780

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