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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. 01, 2022 | Jan. 02, 2021 | Dec. 28, 2019
Change in projected benefit obligations: |  |  |
Projected benefit obligations at beginning of the year | $ 455.8 | $ 401.0 |
Service cost pertaining to benefits earned during the year | 6.9 | 6.4 | $ 5.5
Interest cost on projected benefit obligations | 12.8 | 14.2 | 15.2
Actuarial loss (gain) | (26.6) | 48.1 |
Benefits paid to plan participants | (14.6) | (13.9) |
Projected benefit obligations at end of the year | 434.3 | 455.8 | 401.0
Change in fair value of pension assets: |  |  |
Fair value of pension assets at beginning of the year | 305.0 | 287.6 |
Actual return on plan assets | 30.1 | 28.8 |
Benefits paid to plan participants | (14.6) | (13.9) |
Fair value of pension assets at end of the year | 323.0 | 305.0 | $ 287.6
Funded status | (111.3) | (150.8) |
Amounts recognized in the consolidated balance sheets: |  |  |
Current liabilities | (3.9) | (3.8) |
Accrued pension liabilities | (107.4) | (147.0) |
Net amount recognized | (111.3) | (150.8) |
Funded status of pension plans and SERP (supplemental): |  |  |
Funded status of qualified defined benefit plans and SERP | (111.3) | (150.8) |
Nonqualified trust assets | 45.6 | 44.0 |
Net funded status of pension plans and SERP (supplemental) | (73.3) | (114.2) |
SERP [Member] |  |  |
Change in fair value of pension assets: |  |  |
Company contributions | 2.5 | 2.5 |
Funded status of pension plans and SERP (supplemental): |  |  |
Nonqualified trust assets | $ 38.0 | $ 36.6 |

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