v3.10.0.1
Stockholders’ Equity - Share Based Compensation Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share price (usd per share)     $ 20.88      
Time-Based Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units granted (shares)     500,000      
Performance-Based Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units granted (shares)     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          
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)     1,284,000      
Weighted average grant date fair value (in dollars per share)     $ 14.20   $ 10.58  
Unrecognized compensation cost, period for recognition     3 years      
Purchase price for vested RSUs (usd per share)     $ 0.001      
Settled (RSUs) (usd per share)     $ 9.60      
Unrecognized compensation cost     $ 25.7      
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)     $ 9.60 $ 7.46    
Total fair value of vested RSUs     $ 3.5 $ 2.1    
Intrinsic value of options exercised and RSUs vested     $ 12.8 $ 7.2    
Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost, period for recognition     2 years 6 months 23 days      
Stock options granted (shares)     108,000 900,000    
Weighted average exercise price (usd per share)     $ 17.44 $ 12.62    
The aggregate fair value of the options vested     $ 1.2 $ 1.2    
Unrecognized compensation cost     $ 6.3      
Total shares of common stock reserved for future issuance     13,971,000      
2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total shares of common stock reserved for future issuance     2,540,000      
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