Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	21.00%
Federal income tax credits	(3.40%)	(3.10%)	(2.70%)
Stock compensation	(0.20%)	(0.20%)	0.20%
Uncertain tax positions	(1.00%)	0.00%	(0.20%)
Meals and entertainment	0.30%	0.30%	0.20%
Foreign	0.10%	0.10%	0.30%
Other	(0.40%)	1.50%	(0.40%)
State income taxes, net of federal tax effect	5.00%	3.90%	5.20%
Effective income tax rate	21.40%	23.50%	23.60%