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Retirement Benefits (Tables) | 9 Months Ended
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Sep. 24, 2021
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 |  | Nine Months Ended
| September 24, 2021 |  | September 25, 2020 |  | September 24, 2021 |  | September 25, 2020
Pension Benefits |  |  |  |  |  |  |
Service cost | $ | 1,674 |  |  | $ | 2,392 |  |  | $ | 7,119 |  |  | $ | 7,007 |
Interest cost | 2,519 |  |  | 3,351 |  |  | 8,476 |  |  | 9,985 |
Expected return on assets | (5,412) |  |  | (4,706) |  |  | (15,673) |  |  | (14,107) |
Amortization and other | 2,148 |  |  | 2,777 |  |  | 7,254 |  |  | 8,015 |
Net periodic benefit cost | $ | 929 |  |  | $ | 3,814 |  |  | $ | 7,176 |  |  | $ | 10,900 |
Postretirement Medical |  |  |  |  |  |  |
Service cost | $ | 153 |  |  | $ | 152 |  |  | $ | 503 |  |  | $ | 457 |
Interest cost | 124 |  |  | 254 |  |  | 624 |  |  | 762 |
Amortization | 252 |  |  | 183 |  |  | 752 |  |  | 550 |
Net periodic benefit cost | $ | 529 |  |  | $ | 589 |  |  | $ | 1,879 |  |  | $ | 1,769 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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