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Investments - Amortized Cost and Fair Value of the Held-to-Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Oct. 26, 2019
Apr. 30, 2019
Amortized cost of held-to-maturity securities by contractual maturity    
Due within one year $ 161,635  
Due after one year through five years 8,531  
Total 170,166 $ 159,873
Fair value of held-to-maturity securities by contractual maturity    
Due within one year 161,819  
Due after one year through five years 8,533  
Fair Value $ 170,352 $ 159,915