Retirement Plans - Asset Allocations (Detail) - USD ($) $ in Millions		Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		$ 251.4	$ 323.0	$ 305.0
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		100.00%	100.00%
Equity securities [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		44.70%	56.10%
Equity securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	[1]	$ 112.2	$ 181.3
Fixed income securities [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		35.80%	36.80%
Fixed income securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	[1]	$ 90.0	$ 118.9
Real Estate Investment [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		0.00%	6.20%
Real Estate Investment [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	[1]		$ 19.9
Cash and Cash Equivalents
Schedule Of Other Postretirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		18.50%	0.00%
Cash and Cash Equivalents | Fair Value Measured at Net Asset Value Per Share [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		$ 46.6	$ 0.0
Other Investments [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		1.00%	0.90%
Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	[2]	$ 2.6	$ 2.9

[1] In accordance with ASC 820, Fair Value Measurement (“ASC 820”), certain investments are measured at fair value using the net asset value per share as a practical expedient. These assets have not been classified in the fair value hierarchy.

[2] In accordance with ASC 820, investments have been measured using valuation techniques in which one or more significant inputs are unobservable (Level 3). See Note 1 for additional information.