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Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Apr. 24, 2021
Investments
Total investments	$ 51,537	$ 55,404
Investments to enhance returns on cash
Investments
Total investments	27,239	32,475
Investments to fund compensation/retirement plans
Investments
Total investments	14,219	15,350
Other investments
Investments
Total investments	10,079	7,579
Short-term investments
Investments
Marketable securities	16,022	18,037
Held-to-maturity investments	1,337	2,532
Total investments	17,359	20,569
Long-term investments
Investments
Marketable securities	26,599	27,256
Cost basis investments	7,579	7,579
Total investments	$ 34,178	$ 34,835

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