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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 06, 2018 | Jul. 14, 2018 | Dec. 30, 2017 | Oct. 07, 2017 | Oct. 06, 2018 | Oct. 07, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Effective tax rate | 22.50% |  |  | 40.60% | 20.10% | 32.10%
Corporate income tax rate | 21.00% |  |  | 35.00% | 21.00% | 35.00%
Income tax benefit recorded as estimate to the impact of the act |  |  | $ 48,200,000 |  |  |
Adjustments in discrete tax benefit |  | $ 5,600,000 |  |  |  |
Adjustments in reduction to federal income tax payable |  | 16,400,000 |  |  |  |
Increase to federal deferred tax liabilities |  | $ 10,800,000 |  |  |  |
Adjustments to provisional estimate |  |  |  |  | $ 0 |

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