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Long-Term Debt - Schedule of Long-term Debt, at Amortized Cost (Detail) - USD ($)
$ in Thousands
Jan. 31, 2024
Apr. 30, 2023
Debt Instrument [Line Items]    
Long-term borrowings, net of unamortized discount and debt issuance costs $ 396,755 $ 396,194
4.625% Senior Unsecured Notes due 2027    
Debt Instrument [Line Items]    
Less: Unamortized discount and issuance costs (3,245) (3,806)
Long-term borrowings, net of unamortized discount and debt issuance costs 396,755 396,194
4.625% Senior Unsecured Notes due 2027 | Senior Unsecured Notes    
Debt Instrument [Line Items]    
Senior Unsecured Notes $ 400,000 $ 400,000