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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 06, 2018 | Oct. 07, 2017 | Oct. 06, 2018 | Oct. 07, 2017 | Dec. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate | 11.90% | 38.20% | 20.60% | 39.40% |
Federal statutory rate |  |  | 21.00% | 35.00% |
Provisional discrete income tax benefit, re-measurement of deferred income tax assets and liabilities |  |  |  |  | $ 26.0
Income tax benefit resulting from Tax Act | $ 0.5 |  |  |  |

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