Consolidated Statements of Shareholders' Equity and Comprehensive Income (USD $) In Thousands, except Share data	Common Stock [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Translation Adjustment [Member]	Retained Earnings [Member]	Comprehensive Income [Member]	Total
Balance at Jan. 31, 2009
Balance (in Shares)	35,047,234	(4,192,312)
Net income (loss)					$ 2,455	$ 2,455	$ 2,455
Unrealized gain (loss) on marketable securities			93			93	93
Currency translation adjustment				823		823	823
Total comprehensive income (loss)						3,371
Issuance of common stock for CopperGate acquisition	48,513						48,513
Issuance of common stock for CopperGate acquisition (in Shares)	3,931,352
Share-based compensation expense	8,758						8,758
Non-employee share-based compensation	35						35
Tax benefit from stock options	88						88
Net proceeds from common stock issued under share plans	2,807						2,807
Net proceeds from common stock issued under share plans (in Shares)	359,034
Balance at Jan. 30, 2010	421,109	(85,941)	206	983	32,465		368,822
Balance (in Shares)	35,933,278	(4,192,312)
Net income (loss)					9,147	9,147	9,147
Unrealized gain (loss) on marketable securities			146			146	146
Currency translation adjustment				(214)		(214)	(214)
Total comprehensive income (loss)						9,079
Share-based compensation expense	12,559						12,559
Non-employee share-based compensation	18						18
Grants of restricted stock awards (in Shares)	85,137
Tax benefit from stock options	2,320						2,320
Net proceeds from common stock issued under share plans	5,243						5,243
Net proceeds from common stock issued under share plans (in Shares)	800,907
Balance at Jan. 29, 2011	441,249	(85,941)	352	769	41,612		398,041
Balance (in Shares)	37,070,578	(4,192,312)
Net income (loss)					(168,045)	(168,045)	(168,045)
Unrealized gain (loss) on marketable securities			(191)			(191)	(191)
Currency translation adjustment				(327)		(327)	(327)
Total comprehensive income (loss)						(168,563)
Share-based compensation expense	12,023						12,023
Non-employee share-based compensation	2						2
Grants of restricted stock awards (in Shares)	163,070
Tax benefit from stock options	1,595						1,595
Net proceeds from common stock issued under share plans	5,377						5,377
Net proceeds from common stock issued under share plans (in Shares)	974,230
Balance at Jan. 28, 2012	$ 460,246	$ (85,941)	$ 161	$ 442	$ (126,433)		$ 248,475