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Pension, Postretirement and Postemployment Benefits, Beginning of Fair Value Measurement (Details) - USD ($) $ in Thousands | Dec. 25, 2016 | Dec. 27, 2015
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Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | $ 309,300 | $ 259,300
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 58,300 | 51,900
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Equity - Large Cap [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 29,100 | 27,600
Equity - Large Cap [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 29,100 | 27,600
Equity - Large Cap [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Equity - Large Cap [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Equity - Small Cap [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 29,200 | 24,300
Equity - Small Cap [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 29,200 | 24,300
Equity - Small Cap [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Equity - Small Cap [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Equity - International [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 40,100 | 37,500
Equity - International [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Equity - International [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Equity - International [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Equity - Other [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 1,300 | 2,500
Equity - Other [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Equity - Other [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Equity - Other [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Fixed Income Funds [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 119,500 | 122,600
Fixed Income Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Fixed Income Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Fixed Income Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Total Return Fund [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 29,000 | 27,700
Total Return Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Total Return Fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Total Return Fund [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Cash Equivalents [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 61,100 | 17,100
Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | 0 | 0
Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | $ 0 | $ 0

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References No definition available. + Details
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