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Retirement Benefits (Funded Status) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 29, 2023 | Dec. 30, 2022 | Dec. 31, 2021
Change in benefit obligation |  |  |
Settlements | $ (147,000) |  |
Change in plan assets |  |  |
Employer contributions | 20,000 | $ 20,000 |
Pension Benefits |  |  |
Change in benefit obligation |  |  |
Obligation, beginning of year | 315,807 | 418,051 |
Service cost | 5,729 | 8,242 | $ 9,355
Interest cost | 16,535 | 10,996 | 11,409
Actuarial loss (gain) | 32,763 | (110,467) |
Benefit payments | (12,103) | (9,122) |
Plan amendments | (250) | (267) |
Settlements | (149,212) | 0 |
Exchange rate changes | 4,306 | (1,626) |
Obligation, end of year | 213,575 | 315,807 | 418,051
Change in plan assets |  |  |
Fair value, beginning of year | 281,175 | 347,900 |
Actual return on assets | 14,504 | (80,078) |
Employer contributions | 23,066 | 22,756 |
Benefit payments | (12,103) | (9,122) |
Settlements | (149,212) | 0 |
Exchange rate changes | 3,421 | (281) |
Fair value, end of year | 160,851 | 281,175 | 347,900
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (52,724) | (34,632) |
Postretirement Medical Benefits |  |  |
Change in benefit obligation |  |  |
Obligation, beginning of year | 22,930 | 32,122 |
Service cost | 348 | 516 | 670
Interest cost | 1,165 | 839 | 832
Actuarial loss (gain) | (237) | (9,044) |
Benefit payments | (1,552) | (1,503) |
Plan amendments | 0 |  |
Settlements | 0 | 0 |
Exchange rate changes | 0 | 0 |
Obligation, end of year | 22,654 | 22,930 | 32,122
Change in plan assets |  |  |
Fair value, beginning of year | 0 | 0 |
Actual return on assets | 0 | 0 |
Employer contributions | 1,552 | 1,503 |
Benefit payments | (1,552) | (1,503) |
Settlements | 0 | 0 |
Exchange rate changes | 0 | 0 |
Fair value, end of year | 0 | 0 | $ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan | $ (22,654) | $ (22,930) |

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 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 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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