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Income Tax - Reconciliation of Statutory Federal Rate to Effective Rate (Detail)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	35.00%	35.00%
State taxes, net of federal income tax benefit	1.70%	3.10%	2.50%
Stock compensation	0.70%	1.00%
Non-deductible expenses	0.60%	(0.30%)	0.50%
Domestic production activities deduction		0.10%	(0.30%)
Charitable product donations	(0.60%)	0.40%	(0.50%)
Other, net	(0.90%)	0.80%	(0.60%)
Federal rate change effect on deferred taxes	(1.20%)	19.70%
Tax credits	(1.80%)	0.20%
Change in tax contingencies	(2.50%)
Effective income tax rate	17.00%	60.00%	36.60%

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Effective income tax rate reconciliation tax credits (expense) benefit.

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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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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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