Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 27, 2013	Jan. 29, 2012	Jan. 30, 2011
Cash flows from operating activities:
Net income	$ 41,939	$ 89,087	$ 72,572
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation, amortization and impairments	49,192	21,013	16,448
Effect of acquisition fair value adjustments	37,693	0	0
Accretion of deferred financing costs and debt discount	2,545	0	0
Deferred income taxes	(47,623)	(2,023)	3,184
Stock-based compensation	24,528	24,020	29,010
Excess tax benefits on stock based compensation	0	(2,279)	(891)
Loss on disposition of property, plant and equipment	85	1,022	69
Changes in assets and liabilities:
Accounts receivable, net	(5,002)	966	(19,447)
Inventories	(4,251)	676	(14,016)
Prepaid expenses and other assets	5,971	(7,068)	(540)
Accounts payable	4,453	(3,354)	5,986
Accrued liabilities	(10,410)	(26,017)	13,434
Deferred revenue	(1,112)	(1,167)	1,744
Income taxes payable and prepaid taxes	(1,120)	4,962	(16,702)
Other liabilities	5,080	(6)	2,950
Net cash provided by operating activities	101,968	99,832	93,801
Cash flows from investing activities:
Purchases of available-for-sale investments	(24,744)	(93,330)	(168,802)
Proceeds from sales and maturities of available-for-sale investments	112,466	131,748	110,987
Proceeds from sales of property, plant and equipment	0	46	76
Purchase of property, plant and equipment	(23,266)	(21,564)	(25,537)
Purchase of intangible assets	(1,251)	(3,000)	0
Purchase of cost method investment	(2,500)	0	0
Acquisitions, net of cash acquired	(491,717)	0	0
Net cash (used in) provided by investing activities	(431,012)	13,900	(83,276)
Cash flows from financing activities:
Proceeds from debt issuance, net of discount	347,000	0	0
Deferred financing cost	(8,962)	0	0
Payment for interest rate cap	(1,100)	0	0
Excess tax benefits on stock based compensation	0	2,279	891
Proceeds from exercises of stock options	12,855	42,661	29,823
Repurchase of outstanding common stock	(7,769)	(50,665)	(2,819)
Payment of long term debt	(16,875)	0	0
Net cash provided by (used in) financing activities	325,149	(5,725)	27,895
Effect of exchange rate increase (decrease) on cash and cash equivalents	65	(4)	1
Net (decrease) increase in cash and cash equivalents	(3,830)	108,003	38,421
Cash and cash equivalents at beginning of period	227,022	119,019	80,598
Cash and cash equivalents at end of period	223,192	227,022	119,019
Supplemental disclosure of cash flow information
Income taxes paid	5,029	4,059	20,566
Interest paid	$ 10,556	$ 0	$ 0