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Retirement Plans - Asset Allocations (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Document Period End Date |  | Dec. 28, 2019 |  |
Fair value of plan assets |  | $ 287.6 | $ 254.4 | $ 299.6
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 |  | 56.40% | 54.40% |
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] | $ 162.2 | $ 138.2 |
Fixed income securities [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 36.90% | 38.50% |
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] | $ 106.2 | $ 98.0 |
Real Estate Investment [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 5.90% | 6.30% |
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] | $ 16.9 | $ 16.1 |
Other Investments [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 0.80% | 0.80% |
Other Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Schedule Of Other Postretirement Benefits [Line Items] |  |  |  |
Fair value of plan assets | [2] | $ 2.3 | $ 2.1 |
[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 16 for additional information.

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