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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 29, 2018
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 29,
2018		   December 30,
2017		   December 31,
2016		  

Per grant of RSAs and RSUs

   $ 93.75   $ 72.85   $ 40.55  

Per grant of PSUs and MSUs

   $ 97.53   $ 78.40   $ 32.23  

Per grant of stock options

   $ —   $ —   $ 40.38  
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 29,
2018		   December 30,
2017		   December 31,
2016		  

Intrinsic value of stock options exercised

   $ 1,952   $ 2,174   $ 2,560  

Intrinsic value of RSUs that vested

   $ 68,012   $ 53,093   $ 36,502  

Grant date fair value of RSUs that vested

   $ 37,720   $ 32,449   $ 39,853  

Intrinsic value of MSUs that vested

   $ 3,562   $ 687   $ —  

Grant date fair value of MSUs that vested

   $ 1,788   $ 633   $ —  
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 29,
2018		   December 30,
2017		   December 31,
2016		  

Cost of revenues

   $ 1,238   $ 1,090   $ 1,070  

Research and development

     23,867     21,771     19,573  

Selling, general and administrative

     24,972     21,891     18,985  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

    50,077     44,752     39,628  

Income tax benefit

     8,890     11,073     8,496  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

  $ 41,187   $ 33,679   $ 31,132  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of shares reserved of common stock for future issuance

        As of December 29, 2018, the Company had reserved shares of common stock for future issuance as follows (in thousands):

2009 Stock Incentive Plan

     2,343  

2009 Employee Stock Purchase Plan

     985  
​ ​ ​ ​ ​

Total shares reserved

     3,328  
​ ​ ​ ​ ​
​ ​ ​ ​ ​
​ ​ ​ ​ ​
Stock options  
Summary of assumptions used to estimate fair values for stock options

 
   Year Ended  
Stock Options
  December 29,
2018		   December 30,
2017		   December 31,
2016		  

Expected volatility

     —     —     32 %

Risk-free interest rate %

     —     —     1.3 %

Expected term (in years)

     —     —     5.4  

Dividend yield

     —     —     —  
Summary of stock-based compensation activity, options

        A summary of stock-based compensation activity with respect to fiscal 2018 follows:

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

Outstanding at December 30, 2017

     170   $ 38.88              

Exercised

     (33 ) $ 36.45              
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 29, 2018

     137   $ 39.47     7.1   $ 5,327  

Vested at December 29, 2018 and expected to vest

    
83		  
$
40.39		    
7.1		  
$
3,154		  

Exercisable at December 29, 2018

    
50		  
$
37.88		    
7.1		  
$
2,031		  
MSUs  
Summary of assumptions used to estimate fair values for MSUs, Monte Carlo simulation

        The fair values estimated from Monte Carlo simulation for MSUs were calculated using the following assumptions:

 
   Year Ended  
MSUs
  December 29,
2018		   December 30,
2017		   December 31,
2016		  

Expected volatility

     29 %   31 %   30 %

Risk-free interest rate %

     2.4 %   1.6 %   0.9 %

Expected term (in years)

     2.9     2.9     2.9  

Dividend yield

     —     —     —  
RSAs and RSUs  
Summary of stock-based compensation activity, RSAs and RSUs


 

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

Outstanding at December 30, 2017

     1,523   $ —              

Granted

     522   $ —              

Vested or issued

     (730 ) $ —              

Cancelled or forfeited

     (97 ) $ —              
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 29, 2018

     1,218   $ —     0.86   $ 95,620  

Outstanding at December 29, 2018 and expected to vest

    
1,147		  
$
—		    
0.86		  
$
90,008		  
PSUs and MSUs  
Summary of stock-based compensation activity, PSUs and MSUs

 

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

Outstanding at December 30, 2017

     259   $ —              

Granted

     81   $ —              

Earned or issued

     (37 ) $ —              

Cancelled or forfeited

     (21 ) $ —              
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 29, 2018

     282   $ —     1.1   $ 22,164  

Outstanding at December 29, 2018 and expected to vest

    
249		  
$
—		    
1.1		  
$
19,615		  
2009 Employee Stock Purchase Plan  
Summary of assumptions used to estimate fair values for ESPP

        The fair values estimated from the Black-Scholes option-pricing model for ESPP and stock options granted were calculated using the following assumptions:

 
   Year Ended  
Employee Stock Purchase Plan
  December 29,
2018		   December 30,
2017		   December 31,
2016		  

Expected volatility

     30 %   28 %   30 %

Risk-free interest rate %

     2.4 %   1.1 %   0.6 %

Expected term (in months)

     9     8     15  

Dividend yield

     —     —     —