Significant Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Current:
Federal	$ 42,391	$ 30,595	$ 24,090
State	7,403	8,262	6,723
Total current	49,794	38,857	30,813
Deferred:
Federal	6,279	15,407	11,116
State	523	587	220
Total deferred	6,802	15,994	11,336
Total provision for income taxes	$ 56,596	$ 54,851	$ 42,149