Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010
Cash flows from operating activities:
Net income (loss)	$ (149,207)	$ 6,675
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	23,709	20,536
Stock-based compensation	9,132	9,526
Provision for excess and obsolete inventory	8,083	304
Provision for sales discounts and (recovery) of doubtful account	(44)	37
Deferred income taxes	(715)	(76)
Impairment of software license		336
Loss on disposal of equipment	77	54
Accretion of contributed leasehold improvements	(191)	(132)
Impairment of goodwill and intangible assets	111,278
Impairment of investment		5,203
Changes in operating assets and liabilities:
Accounts receivable	5,360	(2,128)
Inventories	7,413	(14,108)
Prepaid expenses and other current assets	(607)	(1,726)
Other non-current assets	123	68
Accounts payable	(5,218)	7,803
Accrued liabilities	(7,886)	2,509
Other long-term liabilities	(5,643)	38
Net cash provided by (used in) operating activities	(4,336)	34,919
Cash flows from investing activities:
Restricted cash	(154)	(83)
Purchases of marketable securities	(60,471)	(99,947)
Sales and maturities of marketable securities	57,575	73,157
Purchases of software, equipment and leasehold improvements	(9,298)	(9,797)
Cash paid in connection with acquisition	(5,000)
Purchases of long-term investments	(2,142)	(1,000)
Net cash used in investing activities	(19,490)	(37,670)
Cash flows from financing activities:
Excess tax benefit from stock-based compensation	399
Net proceeds from exercises of employee stock options and stock purchase rights	3,254	3,003
Net cash provided by financing activities	3,653	3,003
Effect of foreign exchange rate changes on cash and cash equivalents	91	(200)
Increase (decrease) in cash and cash equivalents	(20,082)	52
Cash and cash equivalents at beginning of period	72,732	81,947
Cash and cash equivalents at end of period	52,650	81,999
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 1,037	$ 1,121