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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Summary of stock-based compensation activity

        A summary of stock-based compensation activity with respect to fiscal 2016 follows:

Stock Options
  Shares
(000s)		   Weighted-
Average
Exercise
Price		   Weighted-Average
Remaining
Contractual Term
(In Years)		   Aggregate
Intrinsic
Value
(000s)		  

Outstanding at January 2, 2016

     212   $ 34.64              

Granted

     173   $ 40.39              

Exercised

     (137 ) $ 33.08              

Cancelled or expired

     (20 ) $ 57.26              
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2016

     228   $ 37.95     7.14   $ 6,165  

Vested at December 31, 2016 and expected to vest

    
209		  
$
37.74		    
6.97		  
$
5,708		  

Exercisable at December 31, 2016

    
55		  
$
30.31		    
0.96		  
$
1,908		  
Summary of RSAs and RSUs Activity


 

RSAs and RSUs
  Shares
(000s)		   Weighted-
Average
Purchase
Price		   Weighted-Average
Remaining
Vesting Term
(In Years)		   Aggregate
Intrinsic
Value
(000s)		  

Outstanding at January 2, 2016

     1,554   $ —              

Granted

     1,169   $ —              

Vested or issued

     (871 ) $ —              

Cancelled or forfeited

     (163 ) $ —              
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2016

     1,689   $ —     1.05   $ 109,807  

Outstanding at December 31, 2016 and expected to vest

    
1,568		  
$
—		    
1.05		  
$
101,940		  
Summary of PSUs and MSUs Activity


 

PSUs and MSUs
  Shares
(000s)		   Weighted-
Average
Purchase
Price		   Weighted-Average
Remaining
Vesting Term
(In Years)		   Aggregate
Intrinsic
Value
(000s)		  

Outstanding at January 2, 2016

     250   $ —              

Granted

     131   $ —              

Cancelled or forfeited

     (152 ) $ —              
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2016

     229   $ —     1.41   $ 14,855  

Outstanding at December 31, 2016 and expected to vest

    
184		  
$
—		    
1.41		  
$
11,928		  
Summary of weighted average fair value at the date of grant

        The following summarizes the Company's weighted average fair value at the date of grant:

 
   Year Ended  
 
   December 31,
2016		   January 2,
2016		   January 3,
2015		  

Per grant of RSAs and RSUs

   $ 40.55   $ 49.14   $ 47.93  

Per grant of PSUs and MSUs

   $ 32.23   $ 48.36   $ 60.08  
Summary of stock-based payment and stock option values

        The following summarizes the Company's stock-based payment and stock option values (in thousands):

 
   Year Ended  
 
   December 31,
2016		   January 2,
2016		   January 3,
2015		  

Intrinsic value of stock options exercised

   $ 2,560   $ 6,612   $ 5,674  

Intrinsic value of RSAs and RSUs that vested

   $ 36,502   $ 45,298   $ 32,138  

Grant date fair value of RSAs and RSUs that vested

   $ 39,853   $ 41,072   $ 29,668  
Schedule of stock-based compensation costs recognized in the Consolidated Statements of Income

        The following table presents details of stock-based compensation costs recognized in the Consolidated Statements of Income (in thousands):

 
   Year Ended  
 
   December 31,
2016		   January 2,
2016		   January 3,
2015		  

Cost of revenues

   $ 1,070   $ 960   $ 775  

Research and development

     19,573     19,451     18,521  

Selling, general and administrative

     18,985     22,380     19,771  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

    39,628     42,791     39,067  

Income tax benefit

     8,496     9,264     4,024  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

  $ 31,132   $ 33,527   $ 35,043  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of shares reserved of common stock for future issuance

        As of December 31, 2016, the Company had reserved shares of common stock for future issuance as follows (in thousands):

2000 Stock Incentive Plan

     55  

2009 Stock Incentive Plan

     1,935  

2009 Employee Stock Purchase Plan

     447  
​ ​ ​ ​ ​

Total shares reserved

     2,437  
​ ​ ​ ​ ​
​ ​ ​ ​ ​
​ ​ ​ ​ ​
Stock options  
Schedule of assumptions used to estimate fair values using Black-Scholes option-pricing model for ESSP and stock options

 

 
   Year Ended  
MSUs
  December 31,
2016		   January 2,
2016		   January 3,
2015		  

Expected volatility

     30 %   31 %   33 %

Risk-free interest rate %

     0.9 %   1.0 %   0.7 %

Expected term (in years)

     2.9     2.9     2.8  

Dividend yield

     —     —     —  
Market Stock Units  
Schedule of assumptions used to estimate fair values using Monte Carlo simulation model for Stock Incentive Plan


 

 
   Year Ended  
Stock Options
  December 31,
2016		   January 2,
2016		   January 3,
2015		  

Expected volatility

     32 %   —     —  

Risk-free interest rate %

     1.3 %   —     —  

Expected term (in years)

     5.4     —     —  

Dividend yield

     —     —     —  
2009 Employee Stock Purchase Plan  
Schedule of assumptions used to estimate fair values using Black-Scholes option-pricing model for ESSP and stock options

 

 
   Year Ended  
Employee Stock Purchase Plan
  December 31,
2016		   January 2,
2016		   January 3,
2015		  

Expected volatility

     30 %   31 %   28 %

Risk-free interest rate %

     0.6 %   0.2 %   0.2 %

Expected term (in months)

     15     8     15  

Dividend yield

     —     —     —