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Income Taxes - Narrative (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 30, 2017 USD ($) | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 31, 2018 property
Subsequent Event [Line Items] |  |  |  |  |
Reduction in deferred tax asset |  |  | $ 28,800,000 |  |
Adjustment to deferred tax asset valuation allowance |  |  | 28,600,000 |  |
Deferred income tax expense |  |  | 200,000 |  |
Release of valuation allowance on AMT credits |  |  | 800,000 |  |
Reclassification of AMT credit carryforward |  |  | 800,000 |  |
Partial release of valuation allowance | $ (53,500,000) | $ 0 | (53,450,000) |  |
Deferred tax assets, valuation allowance | 10,415,000 | 12,348,000 | 10,415,000 | $ 97,552,000 |
Unrecognized tax benefits, if recognized, would reduce effective tax rate | 200,000 | 5,500,000 | 200,000 |  |
Additions for tax positions in prior years |  | 6,663,000 | 0 | $ 0 |
Unrecognized tax benefits, interest accrued | 0 | 900,000 | 0 |  |
Unrecognized tax benefits, penalties accrued | $ 0 | 0 | $ 0 |  |
Decrease in unrecognized tax benefits is reasonably possible |  | 1,100,000 |  |  |
Goodwill |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Unrecognized tax benefits, interest accrued |  | 600,000 |  |  |
Interest Expense |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Unrecognized tax benefits, interest accrued |  | $ 300,000 |  |  |
Sales-leaseback of four distribution centers |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of properties subject to sale-leaseback arrangement | property |  |  |  |  | 4

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