Income Taxes - Income taxes paid (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2024
Income taxes paid
Federal	$ 2,250	$ 24,175	$ 17,387
Foreign	$ 385	$ (226)	$ 518
Income Tax Paid, after Refund Received, Foreign Jurisdiction [Extensible Enumeration]	country:DE	country:DE	country:DE
Total income taxes paid	$ 3,606	$ 24,631	$ 20,438
Alabama
Income taxes paid
State	(272)
California
Income taxes paid
State	514
Florida
Income taxes paid
State	351
Maryland
Income taxes paid
State	204
Other
Income taxes paid
State	$ 174	$ 682	$ 2,533

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