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Stock-Based Compensation Plans (Tables)
9 Months Ended
Dec. 31, 2011
Stock-Based Compensation Plans [Abstract]  
Stock-Based compensation expense
      September 30,       September 30,       September 30,       September 30,  
    Three Months Ended     Nine Months Ended  
    December 31,     January 1,     December 31,     January 1,  
(In thousands)   2011     2011     2011     2011  

Stock-based compensation included in:

                               

Cost of revenues

  $ 1,350     $ 1,092     $ 3,944     $ 3,671  

Research and development

    8,655       7,120       23,245       21,665  

Selling, general and administrative

    7,838       6,542       21,320       19,959  
   

 

 

   

 

 

   

 

 

   

 

 

 
    $ 17,843     $ 14,754     $ 48,509     $ 45,295  
   

 

 

   

 

 

   

 

 

   

 

 

 
Summary of option plans activity
      September 30,       September 30,       September 30,       September 30,  
    Three Months Ended     Nine Months Ended  
    December 31,     January 1,     December 31,     January 1,  
    2011     2011     2011     2011  

Expected life of options (years)

    5.2       5.2       5.2       5.1  

Expected stock price volatility

    0.35       0.32       0.32       0.35  

Risk-free interest rate

    0.9     1.4     1.4     1.8

Dividend yield

    2.4     2.3     2.3     2.5
Summary of restricted stock unit activity and related information
      September 30,       September 30,       September 30,       September 30,  
    Three Months Ended     Nine Months Ended  
    December 31,     January 1,     December 31,     January 1,  
    2011     2011     2011     2011  

Risk-free interest rate

    0.4     0.8     0.7     1.0

Dividend yield

    2.4     2.3     2.1     2.5
Weighted-average assumptions in estimation of fair value of employee purchase plan
      September 30,       September 30,  
    Options Outstanding  
(Shares in thousands)   Number of
Shares
    Weighted-
Average
Exercise Price
Per Share
 

April 3, 2010

    31,026     $ 30.51  

Granted

    2,345     $ 26.36  

Exercised

    (5,704   $ 25.42  

Forfeited/cancelled/expired

    (2,698   $ 50.69  
   

 

 

         

April 2, 2011

    24,969     $ 29.11  

Granted

    81     $ 33.12  

Exercised

    (2,454   $ 24.83  

Forfeited/cancelled/expired

    (3,453   $ 37.10  
   

 

 

         

December 31, 2011

    19,143     $ 28.23  
   

 

 

         

Options exercisable at:

               

December 31, 2011

    16,411     $ 28.81  

April 2, 2011

    20,837     $ 30.08  
Employee Stock Option [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted-average assumptions in estimation of fair value of stock options
      September 30,       September 30,  
    RSUs Outstanding  
(Shares in thousands)   Number of
Shares
    Weighted-
Average Grant-
Date Fair Value

Per Share
 

April 3, 2010

    3,652     $ 21.70  

Granted

    2,043     $ 25.14  

Vested

    (1,192   $ 22.23  

Cancelled

    (288   $ 21.99  
   

 

 

         

April 2, 2011

    4,215     $ 23.19  

Granted

    2,243     $ 33.89  

Vested

    (1,237   $ 23.00  

Cancelled

    (331   $ 24.65  
   

 

 

         

December 31, 2011

    4,890     $ 28.04  
   

 

 

         
Restricted Stock Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted-average assumptions in estimation of fair value of restricted stock units
      September 30,       September 30,  
    2012     2011  

Expected life of options (years)

    1.25       1.25  

Expected stock price volatility

    0.29       0.33  

Risk-free interest rate

    0.2     0.3

Dividend yield

    2.4     2.3