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Investments - Components (Details) - USD ($) $ in Thousands	Jul. 29, 2017	Apr. 29, 2017
Investments
Total investments	$ 58,323	$ 53,677
Investments to enhance returns on cash
Investments
Total investments	33,427	33,087
Investments to fund compensation/retirement plans
Investments
Total investments	13,942	13,690
Other investments
Investments
Total investments	10,954	6,900
Other current assets
Investments
Available-for-sale investments	14,788	15,040
Trading securities	21	6
Held-to-maturity investments	1,934	1,867
Total investments	16,743	16,913
Other long-term assets
Investments
Available-for-sale investments	30,626	31,264
Cost basis investment	10,954	5,500
Total investments	$ 41,580	$ 36,764

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