Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Current tax expense:
Federal	$ 4,382	$ 73,950	$ 22,182
State	13,835	16,397	6,210
Current income tax expense (benefit)	18,217	90,347	28,392
Deferred tax expense	82,721	4,123	49,810
Total income tax expense	$ 100,938	$ 94,470	$ 78,202