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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 29, 2018 | Sep. 30, 2017 | Dec. 30, 2017
Income Tax [Line Items] |  |  |  |
Effective income tax rate |  | 24.60% | 30.50% |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, provisional income tax expense (benefit) |  |  |  | $ 7,000,000
Tax Cuts And Jobs Act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense |  |  |  | 13,700,000
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax benefit |  |  |  | $ 6,700,000
Tax Cuts And Jobs Act Of 2017, incomplete accounting, increase (decrease) in provisional income tax expense | $ 1,800,000 | $ 3,900,000 |  |
Minimum |  |  |  |
Income Tax [Line Items] |  |  |  |
Decrease in unrecognized tax benefits |  | 0 |  |
Increase in unrecognized tax benefits |  | 0 |  |
Maximum |  |  |  |
Income Tax [Line Items] |  |  |  |
Decrease in unrecognized tax benefits |  | 800,000 |  |
Increase in unrecognized tax benefits |  | $ 1,500,000 |  |

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