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Investments - Amortized Cost and Fair Value of the Held-to-Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jul. 29, 2017
Apr. 30, 2017
Amortized cost of held-to-maturity securities by contractual maturity    
Due within one year $ 107,831  
Due after one year through five years 33,791  
Total 141,622 $ 159,570
Fair value of held-to-maturity securities by contractual maturity    
Due within one year 107,768  
Due after one year through five years 33,773  
Fair Value $ 141,541 $ 159,465