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Income Taxes - Narrative (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Income Tax [Line Items] |  |  |
Effective income tax rate |  | 23.80% | 24.60%
Tax Cuts And Jobs Act Of 2017, incomplete accounting, increase (decrease) in provisional income tax expense | $ 1.8 |  | $ 3.9
Tax Cuts And Jobs Act Of 2017, incomplete accounting, increase in provisional income tax rate, basis points | 0.50% |  | 0.50%
Minimum |  |  |
Income Tax [Line Items] |  |  |
Decrease in unrecognized tax benefits |  | $ 0.0 |
Increase in unrecognized tax benefits |  | 0.0 |
Maximum |  |  |
Income Tax [Line Items] |  |  |
Decrease in unrecognized tax benefits |  | 2.5 |
Increase in unrecognized tax benefits |  | $ 0.9 |

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