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Quarterly Financial Information (Unaudited Supplemental Quarterly Financial Information) (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 27, 2019 | Dec. 28, 2018 | Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017
Income Statement [Abstract] |  |  |  |  |
Charge for restructuring | $ 3,300 |  | $ 3,334 |  | $ 1,300
Charge for asset impairments | $ 1,200 | $ 6,300 | $ 1,180 | $ 6,269 |

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