Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Feb. 02, 2013	Jan. 28, 2012	Jan. 29, 2011
Net revenue	$ 216,613	$ 182,617	$ 286,915
Cost of revenue	125,588	105,241	146,271
Gross profit	91,025	77,376	140,644
Operating expenses
Research and development	103,478	86,517	77,270
Sales and marketing	34,550	34,467	31,712
General and administrative	27,899	20,829	18,745
Restructuring costs	3,264
Impairment of goodwill		45,108
Impairment of acquired intangible assets		66,170
Impairment of IP, mask sets and design tools	6,569	55,100
Gain on acquisition	(1,389)
Total operating expenses	174,371	253,091	127,727
Income (loss) from operations	(83,346)	(175,715)	12,917
Interest and other income, net	2,325	2,704	2,183
Impairment of investment			(5,203)
Income (loss) before income taxes	(81,021)	(173,011)	9,897
Provision for (benefit from) income taxes	20,747	(4,966)	750
Net income (loss)	$ (101,768)	$ (168,045)	$ 9,147
Net income (loss) per common share:
Basic (in Dollars per share)	$ (3.06)	$ (5.25)	$ 0.29
Diluted (in Dollars per share)	$ (3.06)	$ (5.25)	$ 0.29
Shares used in computing net income (loss) per share:
Basic (in Shares)	33,205	32,036	31,245
Diluted (in Shares)	33,205	32,036	31,732