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Investments - Amortized Cost and Fair Value of the Held-to-Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jan. 27, 2018
Apr. 30, 2017
Amortized cost of held-to-maturity securities by contractual maturity    
Due within one year $ 109,543  
Due after one year through five years 36,704  
Total 146,247 $ 159,570
Fair value of held-to-maturity securities by contractual maturity    
Due within one year 109,399  
Due after one year through five years 36,487  
Fair Value $ 145,886 $ 159,465