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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2017 | Mar. 29, 2019 | Dec. 28, 2018 | Dec. 29, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  |  | $ 2,489 | $ 2,281
Plan Amendment and settlement loss (gain) | $ (3,800) |  | (1,363) | (3,819)
Increase in pension liabilities due to Guaranteed Minimum Pension ruling |  |  | 38,200 |
Accounting Standards Update 2017-07 | Miscellaneous Income (Expense), Net |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  |  | 4,000 | $ 3,700
Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan Amendment and settlement loss (gain) |  | $ 32,000 |  |
CH2M Hill and OMI Retiree Medical Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan Amendment and settlement loss (gain) |  |  | $ 2,200 |

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