Long-Term Debt - Schedule of Long-term Debt, at Amortized Cost (Detail) - USD ($) $ in Thousands	Apr. 30, 2025	Apr. 30, 2024
Debt Instrument [Line Items]
Long-term borrowings, net of unamortized discount and debt issuance costs	$ 397,736	$ 396,946
4.625% Senior Unsecured Notes due 2027
Debt Instrument [Line Items]
Less: Unamortized discount and issuance costs	(2,264)	(3,054)
Long-term borrowings, net of unamortized discount and debt issuance costs	397,736	396,946
4.625% Senior Unsecured Notes due 2027 | Senior Unsecured Notes
Debt Instrument [Line Items]
Senior Unsecured Notes	$ 400,000	$ 400,000