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Employee Benefit Plans - Activity of the Unvested RSUs (Details) - RSU Awards - $ / shares
shares in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Units      
Unvested RSUs at beginning of year (in shares) 156    
Granted (in shares) 75    
Vested (in shares) (94)    
Forfeited (in shares) (2)    
Unvested RSU's at end of year (in shares) 135 156  
Weighted Average Grant- Date Fair Value      
Weighted average grant date fair value, balance at beginning of year (in dollars per share) $ 68.57    
Weighted average grant date fair value, granted (in dollars per share) 86.50 $ 98.12 $ 59.30
Weighted average grant date fair value, vested (in dollars per share) 57.81    
Weighted average grant date fair value, forfeited (in dollars per share) 65.02    
Weighted average grant date fair value, balance at end of year (in dollars per share) $ 86.11 $ 68.57