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Income Taxes - Income Tax Expense/(Benefit) from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Current:
Federal	$ 64,417	$ 9,877	$ 5,567
State	9,530	1,841	1,918
Total current	73,947	11,718	7,485
Deferred:
Deferred federal	358	(164)	1,665
Deferred state	89	(32)	134
Total deferred	447	(196)	1,799
Total income tax expense/(benefit)	$ 74,394	$ 11,522	$ 9,284

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