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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%