v3.8.0.1
Stockholders’ Equity - Share Based Compensation Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jul. 01, 2017
Apr. 01, 2017
Jul. 01, 2017
Sep. 30, 2017
Sep. 24, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share price (usd per share)       $ 15.89    
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)       400,000    
Performance-based restricted stock units issued   400,000        
Award vesting period   3 years        
Market-Based Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units granted (shares)       200,000    
Performance-based restricted stock units issued 200,000          
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)       1,085,000    
Weighted average grant date fair value (in dollars per share)       $ 9.54   $ 7.08
Unrecognized compensation cost, period for recognition       2 years 3 months 23 days    
Purchase price for vested RSUs (usd per share)       $ 0.001    
Settled (RSUs) (usd per share)       $ 7.59    
Unrecognized compensation cost       $ 14.9    
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)       $ 7.59    
Total fair value of vested RSUs       $ 3.2    
Intrinsic value of options exercised and RSUs vested       $ 10.4    
Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost, period for recognition       2 years 10 months 3 days    
Stock options granted (shares)       974,000 1,400,000  
Weighted average exercise price (usd per share)       $ 12.82 $ 6.68  
The aggregate fair value of the options vested       $ 1.7    
Unrecognized compensation cost       $ 6.4    
Total shares of common stock reserved for future issuance       13,605,000    
2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total shares of common stock reserved for future issuance       2,490,000    
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) $ 12.20   $ 12.20      
Unrecognized compensation cost, period for recognition     1 year 6 months 15 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) $ 11.18   $ 11.18      
Unrecognized compensation cost, period for recognition     1 year 1 month 21 days