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Earnings Per Share (Tables)
12 Months Ended
Apr. 30, 2011
Earnings Per Share  
Computation of Basic and Diluted Earnings per Share from Continuing Operations
                                 
(in 000s, except per share amounts)  
 
Year Ended April 30,   2011     2010     2009        
 
 
Net income from continuing operations attributable to shareholders
  $  419,405     $  488,946     $  513,055          
Amounts allocated to participating securities (nonvested shares)
    (1,085 )     (1,888 )     (2,042 )        
   
Net income from continuing operations
attributable to common shareholders
  $ 418,320     $ 487,058     $ 511,013          
   
Basic weighted average common shares
    309,230       332,283       332,787          
Potential dilutive shares
    547       953       1,752          
   
Dilutive weighted average common shares
    309,777       333,236       334,539          
   
Earnings per share from continuing operations attributable to
common shareholders:
                               
Basic
  $ 1.35     $ 1.47     $ 1.53          
Diluted
    1.35       1.46       1.53