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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