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Income Taxes (Details 1) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Current:      
Federal $ 265.4 $ 262.1 $ 228.2
Foreign 4.2 6.1 6.8
State and local 22.9 20.5 23.7
Deferred:      
Federal (13.9) (15.6) (10.2)
Foreign 2.4 0.9 (6.9)
State and local 3.5 (0.9) (0.1)
Total income tax expense $ 284.5 $ 273.1 $ 241.5