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Retirement Plans - Changes in Company's Assets and Related Obligations for its Pension Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Change in projected benefit obligations: |  |  |
Projected benefit obligations at beginning of the year | $ 401.0 | $ 348.8 |
Service cost pertaining to benefits earned during the year | 6.4 | 5.5 | $ 6.3
Interest cost on projected benefit obligations | 14.2 | 15.2 | 16.5
Actuarial losses | 48.1 | 45.4 |
Benefits paid to plan participants | (13.9) | (13.9) |
Settlement |  |  | 66.6
Projected benefit obligations at end of the year | 455.8 | 401.0 | 348.8
Change in fair value of pension assets: |  |  |
Fair value of pension assets at beginning of the year | 287.6 | 254.4 |
Actual return on plan assets | 28.8 | 44.7 |
Benefits paid to plan participants | (13.9) | (13.9) |
Fair value of pension assets at end of the year | 305.0 | 287.6 | 254.4
Funded status | (150.8) | (113.4) |
Amounts recognized in the consolidated balance sheets: |  |  |
Current liabilities | (3.8) | (3.7) |
Noncurrent liabilities | (147.0) | (109.7) |
Net amount recognized | (150.8) | (113.4) |
Funded status of pension plans and SERP (supplemental): |  |  |
Funded status of qualified defined benefit plans and SERP | (150.8) | (113.4) |
Nonqualified trust assets | 44.0 | 66.8 |
Net funded status of pension plans and SERP (supplemental) | (114.2) | (53.8) |
Settlement loss | 0.0 | 0.0 | $ 7.2
SERP [Member] |  |  |
Change in fair value of pension assets: |  |  |
Company contributions | 2.5 | 2.4 |
Funded status of pension plans and SERP (supplemental): |  |  |
Nonqualified trust assets | $ 36.6 | $ 59.6 |

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