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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 30.40% | 35.00%
Federal income tax credits | (1.40%) | (0.50%) | (0.20%)
Acquisition and integration costs | 0.00% | 1.20% | 0.00%
Stock compensation | (0.50%) | (2.40%) | (1.30%)
Meals and entertainment | 0.30% | 0.30% | 0.30%
Effect of Tax Act | (1.10%) | 1.20% | (0.00%)
Domestic production deduction | 0.00% | (0.80%) | (2.20%)
Valuation allowance for deferred taxes | 0.60% | 0.00% | 0.00%
Foreign | 0.80% | 0.00% | 0.00%
Other | 1.20% | 0.40% | (0.30%)
Total | (0.10%) | (0.60%) | (3.70%)
Effective federal income tax rate | 20.90% | 29.80% | 31.30%
State income taxes, net of federal tax effect | 3.60% | 3.60% | 3.30%
Effective income tax rate | 24.50% | 33.40% | 34.60%

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