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Employee Benefit Plans (Weighted Average Grant Date Fair Value) (Details) - $ / shares
12 Months Ended
Jan. 03, 2020
Dec. 28, 2018
Dec. 29, 2017
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant-date fair value (in dollars per share) $ 8.19 $ 9.07 $ 11.42
ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant-date fair value (in dollars per share) $ 4.85 $ 6.40 $ 6.00