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Share Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee stock purchase program discount percentage 15.00%   15.00%  
Share-based compensation plan modifications     no  
Share-based Payment Arrangement, Noncash Expense $ 8,800 $ 7,800 $ 18,400 $ 16,409
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted     389,290  
Weighted average exercise price     $ 89.59  
Weighted average fair value per option     $ 20.93  
Total unrecognized compensation expense 13,200   $ 13,200  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     1 year 9 months 18 days  
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units granted     245,842  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units granted     56,379  
Restricted Stock Units and Performance-Based Restricted Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average fair value per share     $ 86.98  
Total unrecognized compensation expense $ 29,700   $ 29,700  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years 3 months 18 days