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Stock-Based Compensation (Schedule of Changes in the Number of Underlying Shares) (Details) (Restricted Stock [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Apr. 30, 2013
Restricted Stock [Member]
 
Number of Underlying Shares [Roll Forward]  
Number of shares outstanding, Beginning balance (shares) 295
Number of shares outstanding, Granted (shares) 85
Number of shares outstanding, Adjusted for dividends or performance (shares) 12
Number of shares outstanding, Vested (shares) (76)
Number of shares outstanding, Forfeited (shares) (2)
Number of shares outstanding, Ending balance (shares) 314
Weighted Average Fair Value at Grant Date [Roll Forward]  
Weighted Average Fair Value at Grant Date, Beginning balance (dollars per share) $ 38.25
Weighted Average Fair Value at Grant Date, Granted (dollars per share) $ 63.15
Weighted Average Fair Value at Grant Date, Adjusted for dividends or performance (dollars per share) $ 42.86
Weighted Average Fair Value at Grant Date, Vested (dollars per share) $ 32.51
Weighted Average Fair Value at Grant Date, Forfeited (dollars per share) $ 56.70
Weighted Average Fair Value at Grant Date, Ending balance (dollars per share) $ 46.41