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Postretirement Plans - Summary of Target Allocation and Weighted-Average Asset Allocation by Asset Category and Fair Value of Plan Assets (Detail) - U.S. Postretirement Health Care Plans - USD ($)
$ in Millions
Jan. 01, 2022
Jan. 02, 2021
Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items]      
Target allocation 100.00%    
Actual weighted-average asset allocation 100.00% 100.00%  
Fair value of plan assets $ 13.7 $ 13.3 $ 12.8
Debt securities and cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation 46.00%    
Actual weighted-average asset allocation 44.00% 46.00%  
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation 29.00%    
Actual weighted-average asset allocation 34.00% 35.00%  
Fair value of plan assets $ 4.6 $ 4.6  
Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation 25.00%    
Actual weighted-average asset allocation 22.00% 19.00%  
Fair value of plan assets $ 3.0 $ 2.5