Company's Effective Tax Rate Differs From Statutory Federal Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2014	Dec. 28, 2012	Dec. 30, 2011
Schedule Of Company Effective Tax Rate Differs From Statutory Federal Tax Rate [Line Items]
Tax at federal statutory rate	$ 22,381	$ 21,612	$ 19,187
State taxes, net of federal benefit	2,819	2,409	2,568
Tax exempt interest income	(36)	(104)	(74)
Non-deductible expenses	226	296	240
Non-deductible stock-based compensation	(79)	(40)	12
Other	(6)	351	191
Total	$ 25,305	$ 24,524	$ 22,124
Effective tax rate	39.60%	39.70%	40.40%