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Retirement Benefits (Tables) | 6 Months Ended
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Jun. 27, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Components of Net Periodic Benefit Cost | The components of net periodic benefit cost for retirement benefit plans were as follows (in thousands):
| Three Months Ended |  | Six Months Ended
| June 27, 2025 |  | June 28, 2024 |  | June 27, 2025 |  | June 28, 2024
Pension Benefits |  |  |  |  |  |  |
Service cost | $ | 1,039 |  |  | $ | 1,253 |  |  | $ | 2,292 |  |  | $ | 2,720 |
Interest cost | 2,568 |  |  | 2,204 |  |  | 4,711 |  |  | 4,634 |
Expected return on assets | (2,904) |  |  | (2,623) |  |  | (5,807) |  |  | (5,067) |
Amortization and other | 202 |  |  | 707 |  |  | 366 |  |  | 1,643 |
Net periodic benefit cost | $ | 905 |  |  | $ | 1,541 |  |  | $ | 1,562 |  |  | $ | 3,930 |
Postretirement Medical |  |  |  |  |  |  |
Service cost | $ | 78 |  |  | $ | 67 |  |  | $ | 153 |  |  | $ | 167 |
Interest cost | 369 |  |  | 256 |  |  | 569 |  |  | 556 |
Amortization | (136) |  |  | (28) |  |  | (136) |  |  | (53) |
Net periodic benefit cost | $ | 311 |  |  | $ | 295 |  |  | $ | 586 |  |  | $ | 670 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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