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Postretirement Plans - Summary of Amounts Included in Accumulated Other Comprehensive Income on Accompanying Consolidated Balance Sheets (Detail) - U.S. Postretirement Health Care Plans - USD ($)
$ in Millions
Jan. 01, 2022
Jan. 02, 2021
Defined Benefit Plan Disclosure [Line Items]    
Net gain, net of tax of $0.8 million and $0.5 million, respectively $ 2.3 $ 1.3
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent    
Defined Benefit Plan Disclosure [Line Items]    
AOCI, tax $ 0.8 $ 0.5