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Retirement Plans - Changes in Company's Assets and Related Obligations for its Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Change in projected benefit obligations:
Projected benefit obligations at beginning of the year	$ 401.0	$ 348.8
Service cost pertaining to benefits earned during the year	6.4	5.5	$ 6.3
Interest cost on projected benefit obligations	14.2	15.2	16.5
Actuarial losses	48.1	45.4
Benefits paid to plan participants	(13.9)	(13.9)
Settlement			66.6
Projected benefit obligations at end of the year	455.8	401.0	348.8
Change in fair value of pension assets:
Fair value of pension assets at beginning of the year	287.6	254.4
Actual return on plan assets	28.8	44.7
Benefits paid to plan participants	(13.9)	(13.9)
Fair value of pension assets at end of the year	305.0	287.6	254.4
Funded status	(150.8)	(113.4)
Amounts recognized in the consolidated balance sheets:
Current liabilities	(3.8)	(3.7)
Noncurrent liabilities	(147.0)	(109.7)
Net amount recognized	(150.8)	(113.4)
Funded status of pension plans and SERP (supplemental):
Funded status of qualified defined benefit plans and SERP	(150.8)	(113.4)
Nonqualified trust assets	44.0	66.8
Net funded status of pension plans and SERP (supplemental)	(114.2)	(53.8)
Settlement loss	0.0	0.0	$ 7.2
SERP [Member]
Change in fair value of pension assets:
Company contributions	2.5	2.4
Funded status of pension plans and SERP (supplemental):
Nonqualified trust assets	$ 36.6	$ 59.6

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