Consolidated Condensed Statements of Cash Flows (USD $) In Thousands	3 Months Ended
	May 01, 2011	May 02, 2010
Cash flows from operating activities:
Net income	$ 22,582	$ 10,802
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	4,271	3,870
Deferred income taxes	2,786	760
Stock-based compensation	7,487	8,300
Excess tax benefits on stock based compensation	(1,075)	(257)
Loss on disposition of property, plant and equipment	7	75
Changes in assets and liabilities:
Receivables, net	208	(8,681)
Inventories	(2,449)	466
Prepaid expenses and other assets	(1,182)	(2,387)
Accounts payable	3,859	5,434
Accrued liabilities	(29,041)	(3,789)
Deferred revenue	(108)	177
Income taxes payable and prepaid taxes	(1,320)	(7,907)
Other liabilities	316	1,337
Net cash provided by operations	6,341	8,200
Cash flows from investing activities:
Purchase of available-for-sale investments	(25,000)	(59,732)
Proceeds from sales and maturities of available-for-sale investments	22,583	24,835
Proceeds from sale of property, plant and equipment	5	2
Purchases of property, plant and equipment	(7,469)	(4,486)
Net cash used in investing activities	(9,881)	(39,381)
Cash flows from financing activities:
Excess tax benefits on stock based compensation	1,075	257
Exercise of stock options	18,501	5,069
Repurchase of outstanding common stock	(450)	(376)
Net cash provided by financing activities	19,126	4,950
Net increase (decrease) in cash and cash equivalents	15,586	(26,231)
Cash and cash equivalents at beginning of period	119,019	80,598
Cash and cash equivalents at end of period	$ 134,605	$ 54,367