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Investments - Amortized Cost and Fair Value of the Held-to-Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jul. 28, 2018
Apr. 30, 2018
Amortized cost of held-to-maturity securities by contractual maturity    
Due within one year $ 118,303  
Due after one year through five years 36,712  
Total 155,015 $ 152,163
Fair value of held-to-maturity securities by contractual maturity    
Due within one year 118,120  
Due after one year through five years 36,541  
Fair Value $ 154,661 $ 151,700