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Investments - Components (Details) - USD ($) $ in Thousands	Jan. 26, 2019	Apr. 28, 2018
Investments
Total investments	$ 57,669	$ 59,354
Investments to enhance returns on cash
Investments
Total investments	32,229	34,359
Investments to fund compensation/retirement plans
Investments
Total investments	13,461	14,041
Other investments
Investments
Total investments	11,979	10,954
Other current assets
Investments
Marketable securities	14,580	12,926
Held-to-maturity investments	3,384	3,340
Total investments	17,964	16,266
Other long-term assets
Investments
Marketable securities	27,726	32,134
Cost basis investments	11,979	10,954
Total investments	$ 39,705	$ 43,088

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