Consolidated Statements of Changes in Convertible Preferred Stock and Shareholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common stock [Member]	Additional Paid-in Capital [Member]	Accumulated deficit [Member]	Restricted Stock Units (RSUs) [Member]	Unrestricted stock [Member]	Treasury Stock [Member]
Balance at Feb. 02, 2013	$ 70,744	$ 540	$ 270,637	$ (200,433)
Balance, common stock, shares at Feb. 02, 2013		53,980,797
Share-based compensation expense	9,854	$ 0	9,854
Stock-based compensation expense (in shares)		10,069
Exercise of options and warrants to purchase common stock	1,484	$ 2	1,482
Exercise of options and warrants to purchase common stock (in shares)		196,941
Vesting of restricted shares related to stock option exercises	239		239
Repurchase of unvested restricted shares related to stock option exercises	0		0
Repurchase of unvested restricted shares related to stock option exercises (in shares)		(648)
Dividend paid to shareholders	(99,451)
Excess tax benefit	$ 2,262		2,262
Stock Issued During Period, Shares, Employee Stock Purchase Plans	148,000	3,565
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition			148
Net income	$ 32,142			32,142
Balance at Feb. 01, 2014	116,873	$ 542	284,622	(168,291)
Balance, common stock, shares at Feb. 01, 2014		54,190,724.000
Share-based compensation expense	5,757	$ 0	5,757
Stock-based compensation expense (in shares)		0
Exercise of options and warrants to purchase common stock	1,481	$ 2	1,479
Exercise of options and warrants to purchase common stock (in shares)		207,809
Vesting of restricted shares related to stock option exercises	61		61
Repurchase of unvested restricted shares related to stock option exercises	(1)		(1)
Repurchase of unvested restricted shares related to stock option exercises (in shares)		(87)
Issuance of common stock (in shares)					22,286	4,324
Stock Repurchased and Retired During Period, Value	(314)		(314)
Stock Issued During Period, Value, New Issues	160		160
Stock Repurchased and Retired During Period, Shares					(9,173)
Excess tax benefit	$ 2,049		2,049
Stock Issued During Period, Shares, Employee Stock Purchase Plans	179,000	4,345
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition			179
Net income	$ 48,024			48,024
Balance at Jan. 31, 2015	$ 174,269	$ 544	293,992	(120,267)
Balance, common stock, shares at Jan. 31, 2015	54,420,228	54,420,228.000
Share-based compensation expense	$ 10,876		10,876
Stock-based compensation expense (in shares)		0
Exercise of options and warrants to purchase common stock	912	$ 2	910
Exercise of options and warrants to purchase common stock (in shares)		115,364
Issuance of common stock (in shares)					51,546	7,947
Stock Issued During Period, Value, New Issues	$ 280	$ 0	$ 280
Stock Repurchased and Retired During Period, Shares	(322,000)		(322,000)				(9,462)
Excess tax benefit	$ 608		$ 608
Stock Issued During Period, Shares, Employee Stock Purchase Plans	178,000	5,018
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition			178
Net income	$ 57,680
Balance at Jan. 30, 2016	$ 244,481	$ 546	$ 306,522	$ (62,587)
Balance, common stock, shares at Jan. 30, 2016	54,588,286	54,590,641.000