Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	21.00%
Federal income tax credits	(3.10%)	(2.70%)	5.40%
Stock compensation	(0.20%)	0.20%	(0.30%)
Uncertain tax positions	0.00%	(0.20%)	1.70%
Meals and entertainment	0.30%	0.20%	(0.40%)
Foreign	0.10%	0.30%	0.60%
Other	1.50%	(0.40%)	(0.60%)
State income taxes, net of federal tax effect	3.90%	5.20%	3.40%
Effective income tax rate	23.50%	23.60%	30.80%