Consolidated Statement of Shareholders' Equity - 6 months ended Aug. 01, 2015 - USD ($) $ in Thousands	Total	Common stock [Member]	Additional Paid-in Capital [Member]	Accumulated deficit [Member]
Balance at Jan. 31, 2015	$ 174,269	$ 544	$ 293,992	$ (120,267)
Balance, common stock, shares at Jan. 31, 2015	54,420,228	54,420,228
Share-based compensation expense	$ 5,312		5,312
Stock Issued During Period, Shares, New Issues		3,926
Stock Issued During Period, Value, New Issues	$ 140	$ 0	140
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	93,020	93,020
Stock Issued During Period, Value, Stock Options Exercised	$ 765	$ 1	764	0
Vesting of Restricted Stock Units		6,972
Excess tax benefit related to exercise of stock options	531		531
Stock Issued During Period, Shares, Employee Stock Purchase Plans		2,048
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	81		81
Net income	11,339			11,339
Balance at Aug. 01, 2015	$ 192,437	$ 545	$ 300,820	$ (108,928)
Balance, common stock, shares at Aug. 01, 2015	54,478,408	54,526,194.000