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Income Taxes (Details 2) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Percent of Pretax Income      
Statutory federal income tax rate 35.00% 35.00% 35.00%
State and local income taxes 2.40% 1.90% 1.80%
Domestic manufacturing deduction (2.90%) (3.00%) (3.10%)
Other items - net (0.40%) (0.40%) (0.30%)
Effective income tax rate 34.10% 33.50% 33.40%
Income taxes paid $ 199.3 $ 294.4 $ 279.2