Consolidated Condensed Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 28, 2013	Apr. 29, 2012
Cash flows from operating activities:
Net income	$ 14,777	$ 2,209
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation, amortization and impairments	13,346	6,867
Effect of acquisition fair value adjustments	2,476	14,429
Accretion of deferred financing costs and debt discount	760	328
Deferred income taxes	98	(20,152)
Stock-based compensation	8,626	5,326
Excess tax benefits on stock based compensation	0	(1,842)
(Gain) loss on disposition of property, plant and equipment	(1)	40
Changes in assets and liabilities:
Accounts receivable, net	(11,054)	(264)
Inventories	(4,016)	1,479
Prepaid expenses and other assets	(1,184)	4,112
Accounts payable	2,308	(4,007)
Accrued liabilities	(11,287)	(17,459)
Deferred revenue	1,251	738
Income taxes payable and prepaid taxes	(1,342)	(4,401)
Other liabilities	2,392	863
Net cash provided by (used in) operating activities	17,150	(11,734)
Cash flows from investing activities:
Purchases of available-for-sale investments	(1,050)	(10,106)
Proceeds from sales and maturities of available-for-sale investments	7,998	88,592
Proceeds from sales of property, plant and equipment	8	0
Purchase of property, plant and equipment	(10,750)	(4,630)
Purchase of intangible assets	(2,847)	0
Acquisitions, net of cash acquired	0	(491,717)
Net cash used in investing activities	(6,641)	(417,861)
Cash flows from financing activities:
Proceeds from debt issuance, net of discount	0	347,000
Deferred financing cost	0	(8,962)
Excess tax benefits on stock based compensation	0	1,842
Proceeds from exercises of stock options	2,352	1,606
Repurchase of outstanding common stock	0	(182)
Payment of long term debt	(5,625)	0
Net cash (used in) provided by financing activities	(3,273)	341,304
Effect of exchange rate increase on cash and cash equivalents	0	170
Net increase (decrease) in cash and cash equivalents	7,236	(88,121)
Cash and cash equivalents at beginning of period	223,192	227,022
Cash and cash equivalents at end of period	$ 230,428	$ 138,901