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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 14, 2018	Jul. 15, 2017	Jul. 14, 2018	Jul. 15, 2017	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	22.70%	36.80%	24.80%	35.20%
Federal statutory rate			21.00%	35.00%
Provisional discrete income tax benefit, re-measurement of deferred income tax assets and liabilities					$ 26.0
Federal return due date			Oct. 15, 2018

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Federal return due date.

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Amount of income tax expense for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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