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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 26, 2019	Oct. 27, 2018	Oct. 26, 2019	Oct. 27, 2018
Sales of marketable securities
Proceeds from sales	$ 8,310	$ 2,992	$ 12,370	$ 7,754
Gross realized gains	181	10	187	85
Gross realized losses	(86)	$ (11)	(88)	$ (66)
Fair value of available-for-sale securities by contractual maturity
Within one year	19,860		19,860
Within two to five years	12,181		12,181
Within six to ten years	1,696		1,696
Thereafter	740		740
Total	$ 34,477		$ 34,477

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