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Investments - Components (Details) - USD ($) $ in Thousands	Oct. 24, 2020	Apr. 25, 2020
Investments
Total investments	$ 50,388	$ 48,022
Investments to enhance returns on cash
Investments
Total investments	27,224	28,622
Investments to fund compensation/retirement plans
Investments
Total investments	15,585	12,921
Other investments
Investments
Total investments	7,579	6,479
Short-term investments
Investments
Marketable securities	15,905	18,634
Held-to-maturity investments	2,531	3,337
Total investments	18,436	21,971
Long-term investments
Investments
Marketable securities	24,373	19,572
Cost basis investments	7,579	6,479
Total investments	$ 31,952	$ 26,051

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