Unaudited Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Apr. 28, 2012	Apr. 30, 2011
Net revenue	$ 40,258	$ 60,632
Cost of revenue	19,163	30,840
Gross profit	21,095	29,792
Operating expenses:
Research and development	21,789	21,596
Sales and marketing	6,888	8,501
General and administrative	6,379	5,435
Total operating expenses	35,056	35,532
Loss from operations	(13,961)	(5,740)
Interest and other income, net	491	819
Loss before income taxes	(13,470)	(4,921)
Provision for income taxes	232	749
Net loss	$ (13,702)	$ (5,670)
Net loss per share:
Basic (in Dollars per share)	$ (0.42)	$ (0.18)
Diluted (in Dollars per share)	$ (0.42)	$ (0.18)
Shares used in computing net loss per share:
Basic (in Shares)	32,661	31,731
Diluted (in Shares)	32,661	31,731