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Stock-based Compensation and Other Stock Plans - Performance Awards Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Performance Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average contractual term (in years) 3 years        
Maximum stock percentage to be awarded 100.00%        
Performance period 3 years        
Weighted-average grant date fair value granted (in dollars per share) $ 155.34 $ 155.92      
Performance awards shares paid out (in shares) 21,184 32,114      
Unrecognized compensation cost related to non-vested award $ 8.8        
Cost expected to be recognized over weighted-average period, in years 2 years        
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance period 1 year        
Cliff vesting schedule 2 years        
Granted (in shares)     0 33,170 13,648