Consolidated Condensed Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 29, 2012	Jul. 31, 2011
Cash flows from operating activities:
Net income	$ 12,231	$ 49,720
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation, amortization and impairment	22,545	8,811
Effect of acquisition fair value adjustments	28,600	0
Accretion of deferred financing costs and debt discount	1,081	0
Accrued interest expense	227	0
Deferred income taxes	(12,425)	6,239
Stock-based compensation	10,245	12,108
Excess tax benefits on stock based compensation	(2,913)	(1,719)
Loss on disposition of property, plant and equipment	85	7
Changes in assets and liabilities:
Accounts receivable, net	(13,079)	(693)
Inventories	3,426	(1,526)
Prepaid expenses and other assets	6,301	(7,409)
Accounts payable	(2,344)	4,459
Accrued liabilities	(19,991)	(30,869)
Deferred revenue	1,314	682
Income taxes payable and prepaid taxes	(24,757)	341
Other liabilities	1,325	435
Net cash provided by operating activities	11,871	40,586
Cash flows from investing activities:
Purchases of available-for-sale investments	(10,106)	(83,830)
Proceeds from sales and maturities of available-for-sale investments	103,199	50,004
Proceeds from sales of property, plant and equipment	0	5
Purchase of property, plant and equipment	(10,715)	(15,259)
Acquisitions, net of cash acquired	(491,717)	0
Net cash used in investing activities	(409,339)	(49,080)
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	2,913	1,719
Proceeds from issuance of common stock	2,413	28,896
Repurchase of outstanding common stock	(269)	(551)
Payment of long term debt	(5,625)	0
Net cash provided by financing activities	336,370	30,064
Effect of exchange rate increase on cash and cash equivalents	(66)	0
Net (decrease) increase in cash and cash equivalents	(61,164)	21,570
Cash and cash equivalents at beginning of period	227,022	119,019
Cash and cash equivalents at end of period	$ 165,858	$ 140,589