Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 29, 2016	Oct. 31, 2015
Statement of Cash Flows [Abstract]
Proceeds from Issuance Initial Public Offering	$ 93	$ 81
Operating activities:
Net income	22,052	15,676
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	19,449	16,126
Share-based compensation expense	9,014	8,400
Deferred income tax benefit	(538)	(2,468)
Other non-cash expenses	53	47
Changes in operating assets and liabilities:
Prepaid income taxes	(4,448)	(8,389)
Inventories	(79,805)	(97,983)
Prepaid expenses and other assets	(18,656)	(6,572)
Accounts payable	47,240	64,971
Income taxes payable	(11,816)	(14,203)
Accrued salaries and wages	1,016	895
Deferred rent	7,623	6,916
Other accrued expenses	5,946	15,078
Net cash used in operating activities	(2,870)	(1,506)
Investing activities:
Purchases of investment securities	(35,856)	0
Sales, maturities, and redemptions of investment securities	72,279	0
Capital expenditures	(35,714)	(44,749)
Net cash used in investing activities	709	(44,749)
Financing activities:
Proceeds from exercise of options to purchase common stock	2,736	811
Common shares withheld for taxes	(1,819)	(322)
Excess tax benefit related to exercises of stock options	1,607	582
Net cash provided by financing activities	2,617	1,152
Net decrease in cash and cash equivalents	456	(45,103)
Cash and cash equivalents at beginning of period	53,081	63,186
Cash and cash equivalents at end of period	53,537	18,083
Supplemental disclosures of cash flow information:
Decrease in accrued purchases of property and equipment	$ (80)	$ (4,380)