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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.