Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Income Taxes
Domestic	$ (10,187)	$ 34,274	$ 52,730
Foreign	(8,956)	91	(60)
(Loss) income from continuing operations before income taxes	(19,143)	34,365	52,670
Equity method investment loss	5,889	(10,481)	(5,487)
Total income from continuing operations before income taxes	(13,254)	$ 23,884	$ 47,183
Deferred tax liabilities for income taxes on undistributed earnings	$ 0