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Defined Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 27, 2025	Dec. 28, 2024
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other current liabilities	$ (9.1)	$ (1.6)
Other non-current liabilities	(18.7)	(27.8)
Net amount recognized	(27.8)	(29.4)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other current liabilities	(1.2)	(1.0)
Other non-current liabilities	(4.4)	(4.6)
Net amount recognized	$ (5.6)	$ (5.6)

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- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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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.

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