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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 30, 2017
Summary of stock-based compensation activity

        A summary of stock-based compensation activity with respect to fiscal 2017 follows:

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

Outstanding at December 31, 2016

     228   $ 37.95              

Exercised

     (58 ) $ 35.27              
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 30, 2017

     170   $ 38.88     7.5   $ 8,387  

Vested at December 30, 2017 and expected to vest

    
120		  
$
40.39		    
8.1		  
$
5,744		  

Exercisable at December 30, 2017

    
40		  
$
33.98		    
5.3		  
$
2,173		  

                                                                                                                                                                                                                                
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 December 31, 2016

     1,689   $ —              

Granted

     625   $ —              

Vested or issued

     (726 ) $ —              

Cancelled or forfeited

     (65 ) $ —              
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 30, 2017

     1,523   $ —     0.9   $ 134,534  

Outstanding at December 30, 2017 and expected to vest

    
1,430		  
$
—		    
0.9		  
$
126,228		  

                                                                                                                                                                                                                                
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 December 31, 2016

     229   $ —              

Granted

     107   $ —              

Earned or issued

     (11 ) $ —              

Cancelled or forfeited

     (66 ) $ —              
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 30, 2017

     259   $ —     1.3   $ 22,911  

Outstanding at December 30, 2017 and expected to vest

    
242		  
$
—		    
1.3		  
$
21,388		  

                                                                                                                                                                                                                                
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 30,
2017		   December 31,
2016		   January 2,
2016		  

Per grant of RSAs and RSUs

   $ 72.85   $ 40.55   $ 49.14  

Per grant of PSUs and MSUs

   $ 78.40   $ 32.23   $ 48.36  

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 30,
2017		   December 31,
2016		   January 2,
2016		  

Intrinsic value of stock options exercised

   $ 2,174   $ 2,560   $ 6,612  

Intrinsic value of RSAs and RSUs that vested

   $ 53,093   $ 36,502   $ 45,298  

Grant date fair value of RSAs and RSUs that vested

   $ 32,449   $ 39,853   $ 41,072  

Intrinsic value of MSUs and PSUs that vested

   $ 687   $ —   $ —  

Grant date fair value of MSUs and PSUs that vested

   $ 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 30,
2017		   December 31,
2016		   January 2,
2016		  

Cost of revenues

   $ 1,090   $ 1,070   $ 960  

Research and development

     21,771     19,573     19,451  

Selling, general and administrative

     21,891     18,985     22,380  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

    44,752     39,628     42,791  

Income tax benefit

     11,073     8,496     9,264  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

  $ 33,679   $ 31,132   $ 33,527  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

                                                                                                                                                                                                                                
Summary of shares reserved of common stock for future issuance

        As of December 30, 2017, the Company had reserved shares of common stock for future issuance as follows (in thousands):

2000 Stock Incentive Plan

     15  

2009 Stock Incentive Plan

     2,827  

2009 Employee Stock Purchase Plan

     1,208  
​ ​ ​ ​ ​

Total shares reserved

     4,050  
​ ​ ​ ​ ​
​ ​ ​ ​ ​
​ ​ ​ ​ ​

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

 
   Year Ended  
Stock Options
  December 30,
2017		   December 31,
2016		   January 2,
2016		  

Expected volatility

     —     32 %   —  

Risk-free interest rate %

     —     1.3 %   —  

Expected term (in years)

     —     5.4     —  

Dividend yield

     —     —     —  

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

 
   Year Ended  
MSUs
  December 30,
2017		   December 31,
2016		   January 2,
2016		  

Expected volatility

     31 %   30 %   31 %

Risk-free interest rate %

     1.6 %   0.9 %   1.0 %

Expected term (in years)

     2.9     2.9     2.9  

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 30,
2017		   December 31,
2016		   January 2,
2016		  

Expected volatility

     28 %   30 %   31 %

Risk-free interest rate %

     1.1 %   0.6 %   0.2 %

Expected term (in months)

     8     15     8  

Dividend yield

     —     —     —