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Share-based Compensation, ASU 2016-09 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2016
Dec. 25, 2018
ASU 2016-09    
Cumulative effect on retained earnings   $ 878
ASU 2016-09    
ASU 2016-09    
Cumulative effect on retained earnings $ 100