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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) | 12 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 30.40% | 35.00% | 35.00%
Federal income tax credits | (0.50%) | (0.20%) | (0.00%)
Acquisition and integration costs | 1.20% | 0.00% | 0.00%
Stock compensation | (2.40%) | (1.30%) | (0.00%)
Meals and entertainment | 0.30% | 0.30% | 0.30%
Effect of Tax Act | 1.20% | (0.00%) | (0.00%)
Domestic production deduction | (0.80%) | (2.20%) | (2.50%)
Other | 0.40% | (0.30%) | (0.10%)
Total | (0.60%) | (3.70%) | (2.30%)
Effective federal income tax rate | 29.80% | 31.30% | 32.70%
State income taxes, net of federal tax effect | 3.60% | 3.30% | 3.30%
Effective income tax rate | 33.40% | 34.60% | 36.00%
Income taxes paid |  |  |

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