Unaudited Condensed Consolitated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010
Net revenue	$ 39,725	$ 77,805	$ 147,051	$ 216,310
Cost of revenue	21,723	39,192	86,263	110,563
Gross profit	18,002	38,613	60,788	105,747
Operating expenses:
Research and development	21,633	20,484	65,034	57,065
Sales and marketing	8,545	8,357	25,475	23,023
General and administrative	4,828	4,781	15,460	14,033
Goodwill impairment	45,108		45,108
Intangible assets impairment	66,170		66,170
Total operating expenses	146,284	33,622	217,247	94,121
Income (loss) from operations	(128,282)	4,991	(156,459)	11,626
Interest and other income, net	542	425	2,095	1,603
Impairment of investment				(5,203)
Income (loss) before income taxes	(127,740)	5,416	(154,364)	8,026
Provision for (benefit from) income taxes	(6,165)	351	(5,157)	1,351
Net income (loss)	$ (121,575)	$ 5,065	$ (149,207)	$ 6,675
Net income (loss) per share:
Basic (in Dollars per share)	$ (3.78)	$ 0.16	$ (4.67)	$ 0.21
Diluted (in Dollars per share)	$ (3.78)	$ 0.16	$ (4.67)	$ 0.21
Shares used in computing net income (loss) per share:
Basic (in Shares)	32,139	31,327	31,928	31,167
Diluted (in Shares)	32,139	31,646	31,928	31,610