Income Taxes Summary of tax effects of temporary differences (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Accrued payroll and benefits	$ 6,652	$ 6,523
Capitalized inventory costs	118	145
Accrued expenses	3,068	3,092
Intangible assets	2,005	2,686
Net operating loss carryforwards	8,755	7,107
Deferred rent	4,852	4,385
Vendor Allowances	2,344	0
Other Temporary Differences	2,592	2,440
Deferred Tax Assets, Gross	30,386	26,378
Valuation Allowances and Reserves, Balance	(6,807)	(3,884)	(1,692)	(1,692)
Deferred Tax Assets, Valuation Allowance	(23,579)	(22,494)
Prepaid expenses	(2,474)	(1,999)
Fixed assets	(12,579)	(8,018)
Federal effect of state and foreign deferred items	(1,672)	(2,398)
Non-current Other	(1,024)	(961)
Deferred Tax Liabilities, Gross	(17,749)	(13,376)
Deferred Tax Assets, Net	$ 5,830	$ 9,118