Postretirement Plans - Summary of Fair Value by Asset Category and Level Within Fair Value Hierarchy (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]
Fair value of plan assets	$ 13.7	$ 13.3	$ 12.8
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.3	0.3
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.8	5.9
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.6	4.6
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.0	2.5
Quoted Prices for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.1	6.2
Quoted Prices for Identical Assets (Level 1)   | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.3	0.3
Quoted Prices for Identical Assets (Level 1)   | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.8	5.9
Quoted Prices for Identical Assets (Level 1)   | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Quoted Prices for Identical Assets (Level 1)   | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Investments Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7.6	7.1
Investments Measured at NAV | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Investments Measured at NAV | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Investments Measured at NAV | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.6	4.6
Investments Measured at NAV | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 3.0	$ 2.5