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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 35.00% | 35.00% | 35.00%
Research and experimentation tax credit | (2.30%) | (0.00%) | (0.00%)
Meals and entertainment | 0.50% | 0.80% | 1.50%
Domestic production deduction | (2.40%) | (1.80%) | (0.30%)
Other | 0.10% | 0.70% | 1.40%
Total | (4.10%) | (0.30%) | 2.60%
Effective federal income tax rate | 30.90% | 34.70% | 37.60%
State income taxes, net of federal tax effect | 3.80% | 4.50% | 4.10%
Effective income tax rate | 34.70% | 39.20% | 41.70%
Income taxes paid | $ 13.3 | $ 4.3 | $ 1.2

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to domestic production deduction. + References No definition available. + Details
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