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Employee Benefit Plans (Amounts Recognized in Accumulated Other Comprehensive Income, Not Yet Recognized as a Component of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands | Dec. 27, 2017 | Dec. 28, 2016
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Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unamortized actuarial losses, net | $ 0 | $ 0
Other Defined Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unamortized actuarial losses, net | (1,092) | $ (1,033)
Maximum [Member] | Other Defined Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated other comprehensive income to be recognized in 2018 | $ 100 |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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