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Net Income (Loss) Per Common Share (Narrative) (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2021
Jun. 26, 2020
Jul. 02, 2021
Jun. 26, 2020
Earnings Per Share [Abstract]        
Antidilutive common share equivalents 2 23 3 16