Senior Notes - Carrying Amount of Senior Notes And Interest Expense Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Debt Disclosure [Abstract]
Principal	$ 575,000	$ 575,000
Unamortized debt issuance costs	(5,271)	(6,388)
Long-term debt, net	569,729	568,612
Contractual interest expense	23,719	23,719	$ 23,719
Amortization of debt issuance costs	1,117	1,069	1,023
Total interest expense related to the Senior Notes	$ 24,836	$ 24,788	$ 24,742

Amount of amortization expense attributable to debt issuance costs.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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