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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 29, 2018 | Dec. 30, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Income Taxes [Line Items] |  |  |  |  |  |
Corporate income tax rate |  |  | 21.00% | 35.00% | 35.00% |
Income tax benefit recorded as estimate to the impact of the act |  | $ 48,160,000 | $ 5,575,000 | $ 48,160,000 |  |
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 |  |  |  |  |
Gross amount of unrecognized tax benefits | 750,000 | 1,259,000 | 750,000 | 1,259,000 | $ 1,754,000 | $ 727,000
Unrecognized tax benefits that would impact effective tax rate | 800,000 |  | 800,000 |  |  |
Unrecognized tax benefit, accrued interest | 100,000 | $ 100,000 | 100,000 | $ 100,000 |  |
Domestic Tax Authority |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal net operating loss carryforwards | 3,700,000 |  | 3,700,000 |  |  |
State and Local Jurisdiction |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
State net operating loss carryforwards | 6,200,000 |  | 6,200,000 |  |  |
Credit carryforwards | 4,100,000 |  | $ 4,100,000 |  |  |
Operating loss carryforwards expiration date |  |  | Dec. 31, 2037 |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 200,000 |  | $ 200,000 |  |  |

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