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Investments - Components (Details) - USD ($)
$ in Thousands
Apr. 30, 2016
Apr. 25, 2015
Investments    
Total available-for-sale and trading investments $ 46,976 $ 61,195
Investments to enhance returns on cash    
Investments    
Total available-for-sale and trading investments 33,583 45,490
Investments to fund compensation/retirement plans    
Investments    
Total available-for-sale and trading investments 13,393 15,705
Other current assets    
Investments    
Available-for-sale investments 13,491 16,763
Trading securities   1,127
Held-to-maturity investments 1,826  
Total available-for-sale and trading investments 15,317 17,890
Other long-term assets    
Investments    
Available-for-sale investments $ 31,659 $ 43,305