Consolidated Statement of Shareholders' Equity - 9 months ended Oct. 29, 2016 - USD ($) $ in Thousands	Total	Common stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated deficit [Member]
Balance at Jan. 30, 2016	$ 244,481	$ 546		$ 306,522	$ (62,587)
Balance, common stock, shares at Jan. 30, 2016	54,590,641	54,590,641
Share-based compensation expense	$ 8,790			8,790	0
Issuance of unrestricted stock awards (in shares)		4,922
Issuance of unrestricted stock awards	$ 210	$ 0		210	0
Exercise of options to purchase common stock (in shares)	208,821	208,821
Exercise of options to purchase common stock	$ 2,736	$ 2		2,734	0
Vesting of restricted and performance-based stock units (in shares)		117,543
Restricted Stock or Unit Expense	1	$ 1
Common shares withheld for taxes (in shares)			(44,595)
Common shares withheld for taxes	(1,819)			(1,819)
Excess tax benefit related to exercises of stock options	1,607			1,607
Net income	22,052				22,052
Balance at Oct. 29, 2016	$ 278,151	$ 549		318,137	$ (40,535)
Balance, common stock, shares at Oct. 29, 2016	54,879,306	54,879,306.000
Stock Issued During Period, Shares, Employee Stock Purchase Plans		1,974
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	$ 93			$ 93