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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 03, 2020
Dec. 28, 2018
Dec. 28, 2018
Dec. 29, 2017
Dec. 31, 2010
Jun. 28, 2019
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares available for grant 6,258,319            
Stock-based compensation expense $ 56,602 $ 40,626   $ 23,938      
Stock options granted (in shares) 1,311,000            
Expenses relating to stock match $ 4,600 3,600   1,700      
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options, vesting period 4 years       10 years    
Life of stock options granted 7 years            
Total unrecognized compensation expense $ 33,700            
Unrecognized compensation expense weighted-average period for recognition 2 years 2 months 12 days            
Intrinsic value of options exercised $ 54,100 39,100   85,200      
Cash received from option exercises and purchases under the ESPP 16,400 12,100   17,600      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 23,400 $ 18,900   13,100      
Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense $ 4,900            
Instruments awarded (in shares) 1,926,605 693,131          
RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options, vesting period 4 years            
Total unrecognized compensation expense $ 158,000            
Unrecognized compensation expense weighted-average period for recognition 2 years 8 months 12 days            
Instruments awarded (in shares) 5,842,000            
Number of awards (in shares) 8,801,000 4,857,000 4,857,000        
ESPP              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares available for grant           4,238,999  
Discount rate from market value on purchase date (as a percent) 85.00%            
Discount rate from market value on offering date (as a percent) 85.00%            
Purchase period 6 months            
Stock-based compensation expense $ 2,200 $ 2,200   $ 1,600      
Common stock issued (in shares) 483,009 330,492   434,523      
Average price per share (in dollars per share) $ 12.60 $ 15.74 $ 15.74       $ 11.20
Proceeds from employee stock purchase plan $ 6,100 $ 5,200   $ 4,900      
Performance Share Options (PSO)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options granted (in shares)     308,365        
Exercise threshold, percentage of per share exercise price of the PSO 125.00%            
Performance Shares, Achieved Before December 31, 2020              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Employees percentage 150.00%            
Additional shares to be earned (in shares) 963,136            
Performance Shares, Second Product Approval              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Employees percentage 200.00%            
Additional shares to be earned (in shares) 1,926,605            
Achieved | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of awards (in shares) 281,238            
Vested | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of awards (in shares) 141,004            
Probable | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total unrecognized compensation expense $ 2,100            
Number of awards (in shares) 99,281            
Not Probable | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total unrecognized compensation expense $ 80,200