Long-Term Debt - Schedule of Long-term Debt, at Amortized Cost (Detail) - USD ($) $ in Thousands	Jan. 31, 2023	Apr. 30, 2022
Debt Instrument [Line Items]
Long-term borrowings, net of unamortized discount and debt issuance costs	$ 396,011	$ 395,477
4.625% Senior Unsecured Notes due 2027
Debt Instrument [Line Items]
Less: Unamortized discount and issuance costs	(3,989)	(4,523)
Long-term borrowings, net of unamortized discount and debt issuance costs	396,011	395,477
4.625% Senior Unsecured Notes due 2027 | Senior Unsecured Notes
Debt Instrument [Line Items]
Senior Unsecured Notes	$ 400,000	$ 400,000