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]
Federal statutory rate	21.00%	21.00%	21.00%
Federal income tax credits	(2.70%)	5.40%	(1.20%)
Stock compensation	0.20%	(0.30%)	0.20%
Uncertain tax positions	(0.20%)	1.70%	0.00%
Meals and entertainment	0.20%	(0.40%)	0.10%
Valuation allowance for deferred taxes	0.00%	0.00%	0.00%
Foreign	0.30%	0.60%	0.60%
Other	(0.40%)	(0.60%)	0.20%
State income taxes, net of federal tax effect	5.20%	3.40%	3.20%
Effective income tax rate	23.60%	30.80%	24.10%