Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Income Tax Disclosure [Abstract]
Income taxes at the statutory rates	21.00%	21.00%	21.00%
Federal tax credits	(1.30%)	(1.80%)	(1.50%)
State income taxes, net of federal tax benefit	4.00%	3.80%	3.50%
Impact of phased-in state law changes, net of federal benefit	(0.40%)	(0.80%)	0.00%
ASU 2016-09 benefit (stock-based compensation)	(0.30%)	(1.00%)	(0.60%)
Nondeductible executive compensation	1.10%	1.20%	0.90%
Other	(0.10%)	0.50%	(0.10%)
Effective income tax rate	24.00%	22.90%	23.20%