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Investments - Amortized Cost and Fair Value of the Held-to-Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Amortized cost of held-to-maturity securities by contractual maturity    
Due within one year $ 150,487  
Due after one year through five years 9,386  
Total 159,873 $ 152,163
Fair value of held-to-maturity securities by contractual maturity    
Due within one year 150,498  
Due after one year through five years 9,417  
Fair Value $ 159,915 $ 151,700