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Pension, Postretirement and Postemployment Benefits, Beginning of Fair Value Measurement (Details) - USD ($) $ in Thousands | Dec. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair values of plan assets by asset class and fair value hierarchy level [Abstract] |  |
Fair Value of Plan Asset | $ 357,200 | $ 383,000
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 | 251,300 | 134,500
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 | 0 | 38,400
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 | 0 | 38,400
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 | 0 | 25,300
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 | 0 | 25,300
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 | 0 | 43,900
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 | 43,900
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 | 300 | 300
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 | 251,300 | 217,200
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 | 251,300 | 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 | 0 | 26,900
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 | 26,900
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 | 105,600 | 31,000
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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