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Investments - Components (Details) - USD ($) $ in Thousands	Apr. 28, 2018	Apr. 29, 2017
Investments
Total investments	$ 59,354	$ 53,677
Investments to enhance returns on cash
Investments
Total investments	34,359	33,087
Investments to fund compensation/retirement plans
Investments
Total investments	14,041	13,690
Other investments
Investments
Total investments	10,954	6,900
Other current assets
Investments
Available-for-sale investments	12,832	15,040
Trading securities	94	6
Held-to-maturity investments	3,340	1,867
Total investments	16,266	16,913
Other long-term assets
Investments
Available-for-sale investments	32,134	31,264
Cost basis investments	10,954	5,500
Total investments	$ 43,088	$ 36,764

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