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Retirement Plans - Asset Allocations (Detail) - USD ($) $ in Millions | Dec. 30, 2023 | Dec. 31, 2022 | Jan. 01, 2022
--- | --- | --- | ---
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |  |
Fair value of plan assets |  | $ 262.7 | $ 251.4 |  | $ 323.0
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 |  | 46.70% | 44.70% |  |
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] | $ 122.7 | $ 112.2 |  |
Fixed income securities [Member] |  |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 32.70% | 35.80% |  |
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] | $ 85.8 | $ 90.0 |  |
Cash and Cash Equivalents |  |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 19.90% | 18.50% |  |
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 |  | $ 52.4 | $ 46.6 |  |
Other Investments [Member] |  |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 0.70% | 1.00% |  |
Other Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |  |
Fair value of plan assets |  | $ 1.8 | $ 2.6 | [2] |
[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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