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Stock Award Plans (Tables)
12 Months Ended
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Stock-Based Compensation Expense
     Year Ended
December 31,

2011
     Seven  Months
Ended
December 31,

2010
     Year Ended
May 31,
 

(In thousands)

         2010      2009  

Total stock-based compensation expense

     $40,752         $18,916         $14,849         $5,770   
Summary Of Stock Options Outstanding

(In thousands, except per share amounts)

   Options
Outstanding
    Weighted-Average
Exercise Price
     Options
Exercisable
     Weighted-Average
Exercise Price
 

Balance at May 31, 2009

     4,222        $5.17         4,222         $5.17   

Options exercised

     (732 )      $7.79         

Options forfeited

     (220 )      $18.56         
  

 

 

         

Balance at May 31, 2010

     3,270        $3.42         3,270         $3.42   
  

 

 

         

Options exercised

     (1,382 )      $7.43         

Options assumed

     5,865        $13.64         

Options forfeited

     (78 )      $8.38         
  

 

 

         

Balance at December 31, 2010

     7,675        $10.46         6,434         $9.80   
  

 

 

         

Options exercised

     (3,469 )      $10.21         

Options forfeited

     (230 )      $14.49         
  

 

 

         

Balance at December 31, 2011

     3,976        $10.31         3,499         $9.87   
  

 

 

         
Summary Of Weighted Average Input Assumptions

Expected option life (in years)

   0.11 – 4.54

Risk-free interest rate

   0.17% – 1.36%

Volatility

   30.5% – 54.04%

Dividend yield

   0%
Schedule Of Stock Option And Restricted Stock Unit Activity
      Year Ended
December 31,

2011
     Seven Months
Ended
December 31,

2010
     Year Ended May 31,  

(In thousands)

             2010              2009      

Total intrinsic value of stock options exercised

     33,016         15,001         13,131         9,097   

Total fair value of share awards vested

     36,137         27,633         19,976         4,182   
Stock Option Awards

(In thousands, except per share amounts)

Range of Exercise Prices

   Number of
Options
Outstanding
     Weighted-
Average
Exercise
Price
     Number of
Options
Exercisable
     Weighted-
Average
Exercise
Price
 

$0.96 to $5.09

     879         $3.17         879         $3.17   

$5.13 to $11.50

     1,234         $6.60         1,060         $6.39   

$12.21 to $14.75

     656         $12.53         634         $12.48   

$15.99 to $17.83

     487         $16.70         244         $16.74   

$18.40 to $20.94

     720         $18.96         682         $18.97   
  

 

 

       

 

 

    
     3,976            3,499      
  

 

 

       

 

 

    
Summary Of Additional Information Of Plan Activity
     Nil Costs      Market Value  

(In thousands, except per share amounts)

   Shares     Weighted-Average
Grant Date
Fair Value
     Shares     Weighted-Average
Exercise Price
     Weighted-Average
Grant Date
Fair Value
 

At May 31, 2008

     1,832           5,272        $5.67      

Granted

     3,033        $0.95         0        $0.00         $0.00   

Exercised

     (439 )         0        $0.00      

Canceled or expired

     (577 )         (2,054 )      $3.95      

Transfers

     66           414        $2.20      
  

 

 

      

 

 

      

At May 31, 2009

     3,915           3,632        $2.25      
  

 

 

      

 

 

      

Granted

     24        $2.76         0        $0.00         $0.00   

Exercised

     (487 )         (113 )      $2.76      

Canceled or expired

     (193 )         (950 )      $4.28      

Transfers

     312           548        $2.94      
  

 

 

      

 

 

      

At May 31, 2010

     3,571           3,117        $4.02      
  

 

 

      

 

 

      

Granted

     9        $4.14         0        $0.00         $0.00   

Exercised

     (1,817 )         (991 )      $3.31      

Canceled or expired

     (1,741 )         (1,087 )      $5.16      
  

 

 

      

 

 

      

At December 31, 2010

     22           1,039        $4.19      
  

 

 

      

 

 

      

Exercised

     0           (585 )      $4.12      

Canceled or expired

     0           (450 )      $4.69      

Transfers

     (22 )         (4 )      $5.57      
  

 

 

      

 

 

      

At December 31, 2011

     0           0        $0.00      
  

 

 

      

 

 

      

Options exercisable

     0           0        $0.00      
Service-Based Share Awards [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Unvested Service-Based And Performance-Based Share Awards

(In thousands, except per share amounts)

   Shares     Weighted-Average
Grant Date Fair Value
 

Unvested restricted stock units at May 31, 2009

     3,168        $8.65   
  

 

 

   

Awarded

     1,502        $17.35   

Vested

     (925 )      $8.88   

Forfeited

     (244 )      $12.04   
  

 

 

   

Unvested restricted stock units at May 31, 2010

     3,501        $12.13   
  

 

 

   

Awarded

     1,227        $17.54   

Assumed

     502        $16.07   

Vested

     (1,192 )      $12.33   

Forfeited

     (375 )      $13.42   
  

 

 

   

Unvested restricted stock units at December 31, 2010

     3,663        $14.35   
  

 

 

   

Awarded

     2,247        $20.53   

Vested

     (1,237 )      $13.08   

Forfeited

     (491 )      $16.03   
  

 

 

   

Unvested restricted stock units at December 31, 2011

     4,182        $17.83   
  

 

 

   
Performance-Based Share Awards [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Unvested Service-Based And Performance-Based Share Awards

(In thousands, except per share amounts)

   Shares     Weighted-Average
Grant Date Fair Value
 

Unvested restricted stock awards at May 31, 2010

     0        $0.00   
  

 

 

   

Awarded

     928        $17.09   

Assumed

     495        $14.43   

Vested

     (224 )      $15.06   

Forfeited

     (31 )      $16.41   
  

 

 

   

Unvested restricted stock awards at December 31, 2010

     1,168        $17.20   
  

 

 

   

Vested

     (622 )      $16.39   

Forfeited

     (135 )      $16.77   
  

 

 

   

Unvested restricted stock awards at December 31, 2011

     411        $16.95