Retirement Plans - Changes in Company's Assets and Related Obligations for its Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Change in projected benefit obligations:
Projected benefit obligations at beginning of the year	$ 345.2	$ 328.2
Service cost pertaining to benefits earned during the year	2.8	3.1	$ 5.3
Interest cost on projected benefit obligations	17.8	17.8	13.2
Actuarial loss (gain)	(22.3)	15.7
Benefits paid to plan participants	(31.0)	(17.5)
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	0.0	(2.1)
Settlement	(9.1)	0.0
Projected benefit obligations at end of the year	303.4	345.2	328.2
Change in fair value of pension assets:
Fair value of pension assets at beginning of the year	262.7	251.4
Actual return on plan assets	1.2	24.7
Benefits paid to plan participants	(31.0)	(17.3)
Settlement	(9.1)	0.0
Fair value of pension assets at end of the year	227.9	262.7	$ 251.4
Funded status	(75.5)	(82.5)
Amounts recognized in the consolidated balance sheets:
Current liabilities	(4.1)	(4.1)
Accrued pension liabilities	(71.4)	(78.4)
Funded status of qualified defined benefit plans and SERP	(75.5)	(82.5)
SERP [Member]
Change in fair value of pension assets:
Company contributions	$ 4.1	$ 3.9