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Share Based Payments (Tables)
3 Months Ended12 Months Ended
Jul. 31, 2011
Apr. 30, 2011
Share Based Payments (Tables) [Abstract]  
Summary of the Company's stock option activity and related information 
Stock Options: The following table is a summary of the Company’s stock option activity and related information.
                 
            Weighted-Average  
    Options     Exercise Price  
 
Outstanding at May 1, 2010
    711,987     $ 41.06  
Exercised
    (515,062 )     41.01  
 
Outstanding and exercisable at April 30, 2011
    196,925     $ 41.18  
 
At April 30, 2011, the weighted-average remaining contractual term for stock options outstanding and exercisable was approximately 2.6 years and the aggregate intrinsic value of these stock options was approximately $6,673.
The total intrinsic value of options exercised during 2011, 2010, and 2009 was approximately $13,355, $5,876, and $2,871, respectively.
Summary of the Company's Restricted shares, Deferred shares, Deferred stock units, and Performance units 
Other Equity Awards: The following table is a summary of the Company’s restricted shares, deferred shares, deferred stock units, and performance units.
                                 
    Restricted/                      
    Deferred     Weighted-                
    Shares and     Average             Weighted-  
    Deferred     Grant Date     Performance     Average  
    Stock Units     Fair Value     Units     Fair Value  
 
Outstanding at May 1, 2010
    1,078,722     $ 44.74       190,010     $ 57.37  
Granted
    303,863       58.32       125,360       77.53  
Converted
    190,010       57.37       (190,010 )     57.37  
Vested
    (373,522 )     47.33       0       0  
Forfeited
    (41,807 )     49.08       0       0  
 
Outstanding at April 30, 2011
    1,157,266     $ 49.39       125,360     $ 77.53  
 
Weighted-Average grant date fair values of the Equity 
                                 
    Restricted/                      
    Deferred     Weighted-             Weighted-  
    Shares and     Average             Average  
    Deferred     Grant Date     Performance     Grant Date  
Year Ended April 30,   Stock Units     Fair Value     Units     Fair Value  
 
2011
    303,863     $ 58.32       125,360     $ 77.53  
2010
    504,580       44.63       190,010       57.37  
2009
    570,359       42.29       114,440       43.44  
 
The performance units column represents the number of restricted shares received by certain executive officers, subsequent to year end, upon conversion of the performance units earned during the year. Restricted stock generally vests four years from the date of grant or upon the attainment of a defined age and years of service.
Share based payments
                 
    Three Months Ended  
    July 31,  
 
    2011     2010  
 
Share-based compensation expense included in selling, distribution, and administrative expenses
  $ 5,151     $ 4,340  
Share-based compensation expense included in other merger and integration costs
    881       988  
Share-based compensation expense included in other restructuring costs
    43       64  
 
Total share-based compensation expense
  $ 6,075     $ 5,392  
 
Related income tax benefit
  $ 2,014     $ 1,688  
 
The following table summarizes amounts related to share-based payments.
                         
            April 30,        
    2011     2010     2009  
 
Share-based compensation expense included in selling, distribution, and administrative expenses
  $ 19,896     $ 20,687     $ 14,043  
Share-based compensation expense included in merger and integration costs
    4,148       5,262       8,062  
Share-based compensation expense included in other restructuring costs
    290       0       0  
 
Total share-based compensation expense
  $ 24,334     $ 25,949     $ 22,105  
 
Related income tax benefit
  $ 8,064     $ 8,402     $ 7,261