Unaudited Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Net revenue	$ 63,905	$ 39,725	$ 172,414	$ 147,051
Cost of revenue	38,423	21,723	95,257	86,263
Gross profit	25,482	18,002	77,157	60,788
Operating expenses
Research and development	26,741	21,633	76,505	65,034
Sales and marketing	12,774	8,545	27,457	25,475
General and administrative	6,007	4,828	21,874	15,460
Restructuring	821		821
Goodwill impairment		45,108		45,108
Intangible assets impairment		66,170		66,170
Gain on acquisition			(1,417)
Total operating expenses	46,343	146,284	125,240	217,247
Loss from operations	(20,861)	(128,282)	(48,083)	(156,459)
Interest and other income, net	299	542	1,032	2,095
Loss before provision for (benefit from) income taxes	(20,562)	(127,740)	(47,051)	(154,364)
Provision for (benefit from) income taxes	18,889	(6,165)	19,520	(5,157)
Net loss	$ (39,451)	$ (121,575)	$ (66,571)	$ (149,207)
Net loss per common share:
Basic (in Dollars per share)	$ (1.18)	$ (3.78)	$ (2.02)	$ (4.67)
Diluted (in Dollars per share)	$ (1.18)	$ (3.78)	$ (2.02)	$ (4.67)
Shares used in computing net loss per share:
Basic (in Shares)	33,383	32,139	33,032	31,928
Diluted (in Shares)	33,383	32,139	33,032	31,928