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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 15, 2017 | Jul. 16, 2016 | Jul. 15, 2017 | Jul. 16, 2016
Income Tax Expense Benefit Continuing Operations [Line Items] |  |  |  |
Effective income tax rate | 36.80% | 38.00% | 35.20% | 37.90%
Accounting Standards Update 2016-09 [Member] |  |  |  |
Income Tax Expense Benefit Continuing Operations [Line Items] |  |  |  |
Recognition of tax benefits related to stock based compensation included in provision for income taxes |  |  | $ 1.3 |

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