Income Taxes Summary of tax effects of temporary differences (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Income Tax Disclosure [Abstract]
Accrued expenses	$ 4,241	$ 4,993
Deferred compensation costs	2,321	1,860
Prepaid expenses	(1,721)	(1,487)
Capitalized inventory costs	2,050	2,083
Other inventory discounts	(958)	(1,035)
Federal effect of state and foreign deferred items	(1,080)	(1,414)
Net operating loss carryforwards	964	1,597
Change in tax accounting method	(2,731)	(825)
Other Temporary Differences	1,841	1,661
Total current temporary differences	4,927	7,433
Deferred rent	3,755	2,408
Fixed assets	(4,983)	(4,869)
Intangible assets	3,391	4,012
Charitable contributions	25	27
Noncurrent net operating loss carryforwards	933	1,517
State tax credits	6,105	5,120
Noncurrent federal effect of state and foreign deferred items	(2,292)	(2,072)
Non-Current Share-based compensation	1,389	2,162
Non-current change in tax accounting method	(1,612)	(2,447)
Non-current Other	2,616	2,551
Total non current temporary differences	9,327	8,409
Valuation Allowances and Reserves, Balance	(1,692)	(1,692)	(16,874)	(23,195)
Deferred Tax Assets, Net	$ 12,562	$ 14,150