v3.10.0.1
Stockholders’ Equity - Share Based Compensation Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share price (usd per share)       $ 22.11      
Time-Based Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted (shares)       600,000      
Performance-Based Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted (shares) 300,000 300,000          
Award vesting period       2 years   3 years 4 years
Market-Based Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted (shares) 500,000 500,000          
Award vesting period     5 years        
Weighted average share price targets period     120 days        
Restricted stock units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted (shares)       1,384,000      
Weighted average grant date fair value (in dollars per share)       $ 14.88   $ 10.58  
Unrecognized compensation cost, period for recognition       2 years 8 months 13 days      
Purchase price for vested RSUs (usd per share)       $ 0.001      
Settled (RSUs) (usd per share)       $ 10.76      
Unrecognized compensation cost       $ 22.2      
Restricted Stock Units and Performance-Based Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Settled (RSUs) (usd per share)       $ 10.76 $ 7.59    
Total fair value of vested RSUs       $ 6.2 $ 3.2    
Intrinsic value of options exercised and RSUs vested       $ 19.3 $ 10.4    
Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost, period for recognition       2 years 3 months 22 days      
Stock options granted (shares)       108,000 1,000,000    
Weighted average exercise price (usd per share)       $ 17.44 $ 12.82    
The aggregate fair value of the options vested       $ 1.9 $ 1.7    
Unrecognized compensation cost       $ 5.2      
Total shares of common stock reserved for future issuance       13,633,000      
2014 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total shares of common stock reserved for future issuance       2,576,000      
Maximum | Market-Based Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average grant date fair value (in dollars per share)       $ 16.34      
Unrecognized compensation cost, period for recognition       1 year 7 months 6 days      
Minimum | Market-Based Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average grant date fair value (in dollars per share)       $ 13.99      
Unrecognized compensation cost, period for recognition       10 months 17 days