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Pension Plans - Summary of Target Allocation and Weighted-Average Asset Allocation by Asset Category and Fair Value of Plan Assets (Detail) - USD ($) $ in Millions | Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
--- | --- | --- | ---
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 1,632.4 | $ 1,455.5 | $ 1,215.6
United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 100.00% |  |
Actual weighted-average asset allocation | 100.00% | 100.00% |
Fair value of plan assets | $ 1,401.0 | $ 1,260.5 |
United States | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 1,401.0 | $ 1,260.5 |
United States | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 54.00% |  |
Actual weighted-average asset allocation | 54.00% | 51.00% |
United States | Debt securities and cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 41.00% |  |
Actual weighted-average asset allocation | 41.00% | 40.00% |
United States | Real estate and other real assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 0.00% |  |
Actual weighted-average asset allocation | 0.00% | 1.00% |
United States | Real estate and other real assets | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 4.3 | $ 8.8 |
United States | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 5.00% |  |
Actual weighted-average asset allocation | 5.00% | 8.00% |
United States | Hedge funds | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 73.6 | $ 107.8 |
Foreign Pension Plans | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 100.00% |  |
Actual weighted-average asset allocation | 100.00% | 100.00% |
Fair value of plan assets | $ 231.4 | $ 195.0 |
Foreign Pension Plans | Equity securities | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 46.00% |  |
Actual weighted-average asset allocation | 46.00% | 46.00% |
Foreign Pension Plans | Debt securities and cash and cash equivalents | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 40.00% |  |
Actual weighted-average asset allocation | 40.00% | 40.00% |
Foreign Pension Plans | Insurance contracts and hedge funds | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 14.00% |  |
Actual weighted-average asset allocation | 14.00% | 14.00% |

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