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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 28, 2020 | Mar. 27, 2020 | Dec. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 28, 2018
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |
Change in pension plans, tax benefit (expense) | $ 60 | $ 20 | $ 21 | $ (7) | $ 33 | $ 33

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