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Retirement Benefits (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 25, 2020 USD ($) | Dec. 27, 2019 USD ($)
Defined Contribution Plan |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00% |  |
Company contribution rate for employees not covered by DBP | 2.00% |  |
Company contributions to 401K | $ 10,000 | $ 8,700 | $ 8,400
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 20,000 |  |
Highest earnings years | 5 years |  |
Years preceding retirement | 10 years |  |
Accumulated benefit obligation for all defined benefit plans | $ 388,000 | 465,000 |
Pension Plan - Blue Plan [Member] | Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 53.00% |  |
Pension Plan - Blue Plan [Member] | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 42.00% |  |
Pension Plan - Blue Plan [Member] | Real Estate and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 5.00% |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 22,493 | 22,237 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | 64,886 | 0 |
Settlement loss (gain) | $ 12,285 | 0 | 0
Investments at Net Asset Value, Redemption Frequency | daily |  |
Investments at Net Asset Value, Unfunded Commitments | $ 2,400 |  |
Expected company contributions to retirement plans next year | 1,800 |  |
Pension Benefits | Pension Plan - Blue and Gray Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | $ (63,000) |  |
Plan participants transferred to annuity due to plan settlement | 417 |  |
Settlement loss (gain) | $ 12,000 |  |
Postretirement Medical Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 1,447 | 1,385 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | 0 | 0 |
Settlement loss (gain) | $ 0 | $ 0 | $ 0
Retirement medical plan limit on annual increase in company cost | 3.00% |  |
Expected company contributions to retirement plans next year | $ 1,800 |  |
Assumed health care trend rates |  |  |
Health care cost trend rate assumed for next year | 7.60% |  |
Ultimate health care cost trend rate | 4.50% |  |
Year that rate reaches ultimate trend rate | 2038 |  |
Minimum | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Net Asset Value, Redemption Notice Period | 10 years |  |
Maximum | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Net Asset Value, Redemption Notice Period | 60 days |  |

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- Definition For those employees who are not covered by a defined benefit plan, the percentage of their gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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- Definition Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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