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Retirement Benefits (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 27, 2024 | Dec. 29, 2023 | Dec. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
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 | $ 12,000 | $ 12,000 | $ 10,000
Highest earnings years | 5 years |  |
Years preceding retirement | 10 years |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 20,000 |  |
Accumulated benefit obligation for all defined benefit plans | 180,000 | 186,000 |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | 3,000 | 44,000 | 1,000
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | 3,579 | 149,212 |
Pension settlement losses | $ (346) | (42,169) | 0
Investments at Net Asset Value, Redemption Frequency | daily |  |
Investments at Net Asset Value, Unfunded Commitments | $ 2,000 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 23,216 | 23,066 |
Expected company contributions to retirement plans next year | $ 2,000 |  |
Pension Benefits | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Net Asset Value, Redemption Notice Period | 10 days |  |
Pension Benefits | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments at Net Asset Value, Redemption Notice Period | 60 days |  |
Postretirement Medical Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | $ 0 | 0 |
Pension settlement losses | 0 | 0 | $ 0
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 1,658 | 1,552 |
Retirement medical plan limit on annual increase in company cost | 3.00% |  |
Health care cost trend rate assumed for next year | 8.50% |  |
Ultimate health care cost trend rate | 4.00% |  |
Year that rate reaches ultimate trend rate | 2050 |  |
Expected company contributions to retirement plans next year | $ 2,000 |  |
Equity | Pension Plan - Blue Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 52.00% |  |
Fixed income | Pension Plan - Blue Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 32.00% |  |
Real estate and other | Pension Plan - Blue Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 16.00% |  |
Pension Plan - Blue and Gray Plans | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension settlement losses |  | $ 42,000 |

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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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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