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Share-based Compensation, ASU 2016-09 (Details) - USD ($) $ in Thousands |  | 12 Months Ended
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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 |

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