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Investments - Components (Details) - USD ($) $ in Thousands	Jul. 28, 2018	Apr. 28, 2018
Investments
Total investments	$ 56,762	$ 59,354
Investments to enhance returns on cash
Investments
Total investments	31,565	34,359
Investments to fund compensation/retirement plans
Investments
Total investments	14,243	14,041
Other investments
Investments
Total investments	10,954	10,954
Other current assets
Investments
Marketable securities	12,444	12,926
Held-to-maturity investments	3,038	3,340
Total investments	15,482	16,266
Other long-term assets
Investments
Marketable securities	30,326	32,134
Cost basis investments	10,954	10,954
Total investments	$ 41,280	$ 43,088

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