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Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 27, 2024 | Dec. 29, 2023 | Dec. 30, 2022
Pension Benefits |  |  |
Components of net periodic benefit cost |  |  |
Service cost-benefits earned during the period | $ 5,097 | $ 5,729 | $ 8,242
Interest cost on projected benefit obligation | 9,194 | 16,535 | 10,996
Expected return on assets | (10,147) | (19,141) | (19,754)
Amortization of prior service cost (credit) | (281) | 36 | 84
Amortization of net loss (gain) | 3,255 | 5,999 | 4,701
Settlement loss (gain) | 346 | 42,169 | 0
Cost of pension plans which are not significant and have not adopted ASC 715 | 171 | 368 | 284
Net periodic benefit cost | 7,635 | 51,695 | 4,553
Postretirement Medical Benefits |  |  |
Components of net periodic benefit cost |  |  |
Service cost-benefits earned during the period | 344 | 348 | 516
Interest cost on projected benefit obligation | 1,148 | 1,165 | 839
Expected return on assets | 0 | 0 | 0
Amortization of prior service cost (credit) | 0 | 0 | 0
Amortization of net loss (gain) | 0 | (133) | 345
Settlement loss (gain) | 0 | 0 | 0
Net periodic benefit cost | $ 1,492 | $ 1,380 | $ 1,700

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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