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Defined Benefit Plans - Reconciliation of Level Three Measurements (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 30, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | $ 482.5 |
Ending balance | 468.0 | $ 482.5
Group annuity/insurance contracts (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | 26.0 | 25.5
Actual return on assets related to assets still held | 0.8 | 0.5
Ending balance | $ 26.8 | $ 26.0

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + 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)(A) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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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. + Details
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