Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Treasury Stock [Member]	Accumulated Net Unrealized Investment Gain (Loss) [Member]	Accumulated Translation Adjustment [Member]	Retained Earnings [Member]	Total
Balance, amount at Jan. 30, 2010	$ 421,109	$ (85,941)	$ 206	$ 983	$ 32,465	$ 368,822
Balance, share (in Shares) at Jan. 30, 2010	35,047,234	(4,192,312)
Unrealized gain/loss on marketable securities			146			146
Currency translation adjustment				(214)		(214)
Stock-based compensation expense	12,577					12,577
Grants of restricted stock awards (in Shares)	85,137
Tax effect related to stock options	2,320					2,320
Net proceeds from common stock issued under share plans, amount	5,243					5,243
Net proceeds from common stock issued under share plans, share (in Shares)	800,907
Net income/loss					9,147	9,147
Balance, amount at Jan. 29, 2011	441,249	(85,941)	352	769	41,612	398,041
Balance, share (in Shares) at Jan. 29, 2011	35,933,278	(4,192,312)
Unrealized gain/loss on marketable securities			(191)			(191)
Currency translation adjustment				(327)		(327)
Stock-based compensation expense	12,025					12,025
Grants of restricted stock awards (in Shares)	163,070
Tax effect related to stock options	1,595					1,595
Net proceeds from common stock issued under share plans, amount	5,377					5,377
Net proceeds from common stock issued under share plans, share (in Shares)	974,230
Net income/loss					(168,045)	(168,045)
Balance, amount at Jan. 28, 2012	460,246	(85,941)	161	442	(126,433)	248,475
Balance, share (in Shares) at Jan. 28, 2012	37,070,578	(4,192,312)
Unrealized gain/loss on marketable securities			240			240
Currency translation adjustment				247		247
Stock-based compensation expense	10,595					10,595
Grants of restricted stock awards (in Shares)	10,980
Tax effect related to stock options	(345)					(345)
Net proceeds from common stock issued under share plans, amount	4,574					4,574
Net proceeds from common stock issued under share plans, share (in Shares)	1,152,799
Net income/loss					(101,768)	(101,768)
Balance, amount at Feb. 02, 2013	$ 475,070	$ (85,941)	$ 401	$ 689	$ (228,201)	$ 162,018
Balance, share (in Shares) at Feb. 02, 2013	38,234,357	(4,192,312)