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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.

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