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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 35.00% | 35.00% | 35.00%
Research and experimentation tax credit | (0.20%) | (0.00%) | (2.30%)
Stock Compensation | (1.30%) | 0.00% | 0.00%
Meals and entertainment | 0.30% | 0.30% | 0.50%
Domestic production deduction | (2.20%) | (2.50%) | (2.40%)
Other | (0.30%) | (0.10%) | 0.10%
Total | (3.70%) | (2.30%) | (4.10%)
Effective federal income tax rate | 31.30% | 32.70% | 30.90%
State income taxes, net of federal tax effect | 3.30% | 3.30% | 3.80%
Effective income tax rate | 34.60% | 36.00% | 34.70%
Income taxes paid | $ 27.3 | $ 24.5 | $ 13.3

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