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Postretirement Plans - Schedule of Fair Value by Asset Category and Level Within Fair Value Hierarchy (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]
Fair value of plan assets	$ 11.6	$ 11.4	$ 11.2
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.2	0.2
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.0	5.1
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.3	3.2
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.1	2.9
Quoted Prices for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.2	5.3
Quoted Prices for Identical Assets (Level 1)   | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.2	0.2
Quoted Prices for Identical Assets (Level 1)   | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.0	5.1
Quoted Prices for Identical Assets (Level 1)   | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Quoted Prices for Identical Assets (Level 1)   | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Investments Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.4	6.1
Investments Measured at NAV | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Investments Measured at NAV | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Investments Measured at NAV | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.3	3.2
Investments Measured at NAV | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 3.1	$ 2.9

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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.

+ 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)(02)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-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
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