Income Taxes - Reconciliation to Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Income Tax Disclosure [Abstract]
Federal income taxes at statutory rate	$ 93,976	$ 76,613	$ 28,793
State income taxes, net of federal income tax benefit	16,847	14,730	4,000
Impact of foreign rate differences	1,052	(2,827)	(1,055)
Net change in valuation allowance	443	350	578
Equity-based compensation	(1,942)	(1,659)	(1,012)
GILTI	1,452	1,076	1,911
Financing structure	0	0	(2,315)
Other	2,684	3,094	634
Total provision for income taxes	$ 114,512	$ 91,377	$ 31,534