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Share-Based Payments (Details 3) - $ / shares
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Restricted Shares And Deferred Stock Units [Member]      
Weighted-average grant date fair values of the equity awards      
Granted Restricted Shares and Deferred Stock Units and Performance Units 109,091 167,134 109,770
Granted Weighted Average Grant Date Fair Value, in USD per share $ 104.82 $ 101.08 $ 76.37
Performance Units [Member]      
Weighted-average grant date fair values of the equity awards      
Granted Restricted Shares and Deferred Stock Units and Performance Units 75,848 101,020 106,666
Granted Weighted Average Conversion Date Fair Value, in USD per share $ 111.41 $ 104.91 $ 100.54