Consolidated Condensed Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 28, 2012	Oct. 30, 2011
Cash flows from operating activities:
Net income	$ 28,821	$ 76,699
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation, amortization and impairment	35,300	16,084
Effect of acquisition fair value adjustments	33,251	0
Accretion of deferred financing costs and debt discount	1,819	0
Accrued interest expense	186	0
Deferred income taxes	(12,586)	5,209
Stock-based compensation	16,727	17,149
Excess tax benefits on stock based compensation	(3,335)	(2,327)
Loss (gain) on disposition of property, plant and equipment	85	(6)
Changes in assets and liabilities:
Accounts receivable, net	(8,646)	(9,004)
Inventories	1,233	560
Prepaid expenses and other assets	5,880	(8,115)
Accounts payable	5,377	6,579
Accrued liabilities	(13,168)	(27,629)
Deferred revenue	(231)	(397)
Income taxes payable and prepaid taxes	(27,694)	(881)
Other liabilities	3,760	(353)
Net cash provided by operating activities	66,779	73,568
Cash flows from investing activities:
Purchases of available-for-sale investments	(17,122)	(90,331)
Proceeds from sales and maturities of available-for-sale investments	104,699	95,122
Proceeds from sales of property, plant and equipment	0	18
Purchase of property, plant and equipment	(18,115)	(18,007)
Purchase of intangible assets	(250)	(3,000)
Acquisitions, net of cash acquired	(491,717)	0
Net cash used in investing activities	(422,505)	(16,198)
Cash flows from financing activities:
Proceeds from debt issuance, net of discount	347,000	0
Deferred financing cost	(8,962)	0
Payment for interest rate cap	(1,100)	0
Excess tax benefits on stock based compensation	3,335	2,327
Proceeds from issuance of common stock	4,839	35,005
Repurchase of outstanding common stock	(269)	(30,579)
Payment of long term debt	(11,250)	0
Net cash provided by financing activities	333,593	6,753
Effect of exchange rate increase (decrease) on cash and cash equivalents	65	(2)
Net (decrease) increase in cash and cash equivalents	(22,068)	64,121
Cash and cash equivalents at beginning of period	227,022	119,019
Cash and cash equivalents at end of period	$ 204,954	$ 183,140