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Retirement and Other Employee Benefits - Assumptions Used in the Calculation of Benefit Obligations and Net Periodic Pension Costs of U.S. and U.K. Defined Benefit Pension Plans and Central American Plans (Detail) | 12 Months Ended
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Dec. 27, 2024 | Dec. 29, 2023 | Dec. 30, 2022
Pension plans | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average discount rate | 5.40% | 4.90% | 5.15%
Rate of increase in compensation levels | 0.00% | 0.00% | 0.00%
Weighted average discount rate | 4.90% | 5.15% | 2.65%
Rate of increase in compensation levels | 0.00% | 0.00% | 0.00%
Expected long-term rate of return on assets | 7.00% | 7.00% | 6.50%
Pension plans | United Kingdom |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average discount rate | 5.50% | 4.80% | 5.00%
Rate of increase in compensation levels | 0.00% | 0.00% | 0.00%
Weighted average discount rate | 4.80% | 5.00% | 1.80%
Rate of increase in compensation levels | 0.00% | 0.00% | 0.00%
Expected long-term rate of return on assets | 5.90% | 6.16% | 2.77%
Post-retirement plans | Central America |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average discount rate | 7.31% | 7.79% | 8.26%
Rate of increase in compensation levels | 4.64% | 4.78% | 4.80%
Weighted average discount rate | 7.77% | 8.21% | 6.39%
Rate of increase in compensation levels | 4.64% | 3.22% | 4.69%
Expected long-term rate of return on assets | 0.00% | 0.00% | 0.00%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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