Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	9 Months Ended
	Oct. 29, 2011		Oct. 30, 2010
Cash flows from operating activities:
Net income	$ 53,346		$ 44,850
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	19,173		18,107
Loss on disposals of property, plant and equipment	221		150
Non-cash equity compensation	2,040		701
Increase (decrease) in deferred taxes	3,141		455
Net (increase) in operating working capital and other components	(84,837)		(59,194)
Net cash provided by operating activities	(6,916)		5,069
Cash flows from investing activities:
Capital expenditures	(26,215)	[1]	(20,696)	[1]
Proceeds from maturities of short-term investments	348,768		134,840
Payments to acquire short-term investments	(283,605)		(44,850)
Net cash provided by (used in) investing activities	38,948		69,294
Cash flows from financing activities:
Income tax benefit from exercise of stock options	1,883		1,300
Net proceeds from exercise of stock options	546		1,012
Payments For Fractional Share	0		(21)
Net cash provided by financing activities	2,429		2,291
Net increase in cash and cash equivalents	34,461		76,654
Cash and cash equivalents - beginning of period	80,979		21,853
Cash and cash equivalents - end of period	$ 115,440		$ 98,507

[1] Capital expenditures include payments for property, plant and equipment made for the reportable segment.