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Defined Benefit Plans - Amounts in Accumulated Other Comprehensive loss that have not yet been Recognized as Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 28, 2024	Dec. 27, 2025	Dec. 28, 2024	Dec. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Recognition of actuarial gain		$ 0.0	$ (18.3)	$ 0.5
Recognition actuarial loss due to settlement	$ 19.0
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Recognition of actuarial gain		8.8	23.9
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Recognition of actuarial gain		0.3	0.4
Other Accumulated Other Comprehensive Income | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance		12.8	35.2
Recognition of actuarial gain		0.0	0.5
Current year actuarial (gain)		(0.7)	(3.9)
Recognition actuarial loss due to settlement		0.0	(19.0)
Ending Balance	12.8	12.1	12.8	35.2
Other Accumulated Other Comprehensive Income | Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance		(0.5)	0.6
Recognition of actuarial gain		0.3	0.3
Current year actuarial (gain)		(0.3)	(1.4)
Recognition actuarial loss due to settlement		0.0	0.0
Ending Balance	$ (0.5)	$ (0.5)	$ (0.5)	$ 0.6

X

- Definition

Defined Benefit Plan Unrecognized Actuarial Net Gains Losses

+ References

No definition available.

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- Definition

Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

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- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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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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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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