Income Taxes - Income Tax Expense/(Benefit) from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Current:
Federal	$ 52,843	$ 64,417	$ 9,877
State	7,174	9,530	1,841
Total current	60,017	73,947	11,718
Deferred:
Federal	(1,889)	358	(164)
State	(236)	89	(32)
Total deferred	(2,125)	447	(196)
Total income tax expense	$ 57,892	$ 74,394	$ 11,522