Common Stock and Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 26, 2016
Summary of Stock Options under Equity Plan and Non-Employee Director Plan

Information related to stock options under the Equity Plan and the Non-Employee Director Plan is summarized as follows:

 

     Shares     Weighted-
Average
Exercise
Price		      Weighted-Average
Remaining
Contractual Term
in Years		      Aggregate
Intrinsic
Value
(in thousands)		  

Outstanding at December 26, 2015

      1,127,162      $ 63.99         

Granted

      730,391        201.02         

Forfeited

      (14,742 )      289.54         

Expired

      —          —           

Exercised

      (217,928 )      93.37         
  

 

 

    

 

 

     

 

 

     

 

 

  

Outstanding at March 26, 2016

      1,624,883      $ 125.57         5.97       $ 109,116   
  

 

 

    

 

 

     

 

 

     

 

 

  

Exercisable at March 26, 2016

      503,621      $ 69.59         2.69       $ 58,566   
  

 

 

    

 

 

     

 

 

     

 

 

  

Vested and expected to vest at March 26, 2016

      1,568,821      $ 124.68         5.92       $ 106,588   
  

 

 

    

 

 

     

 

 

     

 

 

  
Summary of Vesting Activities of Shares Issued Under Investment Share Program and Restricted Stock Awards

The following table summarizes vesting activities of shares issued under the investment share program and restricted stock awards:

 

     Number
of
Shares		      Weighted
Average
Fair
Value		  

Non-vested at December 26, 2015

      60,922       $ 150.03   

Granted

      27,221         161.39   

Vested

      (19,232 )       111.63   

Forfeited

      (1,633 )       134.65   
  

 

 

     

Non-vested at March 26, 2016

      67,278       $ 165.98