Reconciliations to Statutory Rates (Detail)	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Reconciliation of Statutory Federal Tax Rate [Line Items]
Statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	3.40%	4.00%	4.10%
Deduction relating to U.S. production activities	(2.70%)	(2.10%)	(2.20%)
Change in uncertain tax positions			(0.90%)
Other	0.80%	0.80%	1.50%
Effective Income Tax Rate Reconciliation, Percent, Total	36.50%	37.70%	37.50%