Income Taxes - Change in Uncertain Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 3,567	$ 1,855	$ 1,163
Reductions due to lapses in statutes of limitations	(181)
Reductions due to tax positions settled	(4,543)	(109)	(177)
Reductions due to reversals of prior year positions		(212)	(20)
Additions based on tax positions taken during the prior period	3,005
Additions based on tax positions taken during the current period	453	2,033	889
Balance at end of year	$ 2,301	$ 3,567	$ 1,855