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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 21.00% | 30.40%
Federal income tax credits | (0.90%) | (1.40%) | (0.50%)
Acquisition and integration costs | 0.00% | 0.00% | 1.20%
Stock compensation | (0.10%) | (0.50%) | (2.40%)
Meals and entertainment | 0.30% | 0.30% | 0.30%
Effect of Tax Act | 0.00% | (1.10%) | 1.20%
Domestic production deduction | 0.00% | 0.00% | (0.80%)
Valuation allowance for deferred taxes | 0.70% | 0.60% | 0.00%
Foreign | 0.40% | 0.80% | 0.00%
Other | 0.70% | 1.20% | 0.40%
Total | 1.10% | (0.10%) | (0.60%)
Effective federal income tax rate | 22.10% | 20.90% | 29.80%
State income taxes, net of federal tax effect | 3.40% | 3.60% | 3.60%
Effective income tax rate | 25.50% | 24.50% | 33.40%

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