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Postretirement Plans - Summary of Target Allocation and Weighted-Average Asset Allocation by Asset Category and Fair Value of Plan Assets (Detail) - U.S. Postretirement Health Care Plans - USD ($) $ in Millions	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Actual weighted-average asset allocation	100.00%	100.00%
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 11.6	$ 11.4	$ 11.2
Debt securities and cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Target allocation	46.00%
Actual weighted-average asset allocation	45.00%	46.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	29.00%
Actual weighted-average asset allocation	28.00%	29.00%
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 3.3	$ 3.2
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation	25.00%
Actual weighted-average asset allocation	27.00%	25.00%
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 3.1	$ 2.9

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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