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Income Tax - Reconciliation of Statutory Federal Rate to Effective Rate (Detail)
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]      
Federal statutory income tax rate 35.00% 35.00% 35.00%
Federal rate change effect on deferred taxes 19.70%    
State taxes, net of federal income tax benefit 3.10% 2.50% 1.60%
Stock compensation 1.00%    
Other, net 0.80% (0.60%) 0.50%
Charitable product donations 0.40% (0.50%) (0.30%)
Tax credits 0.20%    
Domestic production activities deduction 0.10% (0.30%) (0.20%)
Non-deductible expenses (0.30%) 0.50% 0.40%
Effective income tax rate 60.00% 36.60% 37.00%