Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 26, 2014	Jan. 27, 2013	Jan. 29, 2012
Cash flows from operating activities:
Net (loss) income	$ (164,466)	$ 41,939	$ 89,087
Adjustments to reconcile net (loss) income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation, amortization and impairments	94,073	49,192	21,013
Goodwill impairment	116,686	0	0
Effect of acquisition fair value adjustments	2,529	37,693	0
Accretion of deferred financing costs and debt discount	1,509	2,545	0
Write-off of deferred financing costs and debt discount	7,093	0	0
Deferred income taxes	29,987	(47,623)	(2,023)
Stock-based compensation	24,589	24,528	24,020
Excess tax benefits on stock based compensation	(4,220)	0	(2,279)
(Gain) loss on disposition of property, plant and equipment	(28)	85	1,022
Changes in assets and liabilities:
Accounts receivable, net	2,827	(5,002)	966
Inventories	12,238	(4,251)	676
Prepaid expenses and other assets	623	5,971	(7,068)
Accounts payable	(11,294)	4,453	(3,354)
Accrued liabilities	(2,739)	(10,410)	(26,017)
Deferred revenue	3,401	(1,112)	(1,167)
Income taxes payable and prepaid taxes	1,825	(1,120)	4,962
Other liabilities	3,348	5,080	(6)
Net cash provided by operating activities	117,981	101,968	99,832
Cash flows from investing activities:
Purchases of available-for-sale investments	(1,050)	(24,744)	(93,330)
Proceeds from sales and maturities of available-for-sale investments	10,249	112,466	131,748
Proceeds from sales of property, plant and equipment	57	0	46
Purchase of property, plant and equipment	(37,161)	(23,266)	(21,564)
Purchase of intangible assets	(3,533)	(1,251)	(3,000)
Purchase of cost method investment	(2,500)	(2,500)	0
Acquisitions, net of cash acquired	0	(491,717)	0
Net cash (used in) provided by investing activities	(33,938)	(431,012)	13,900
Cash flows from financing activities:
Proceeds from debt issuance, net of discount	327,344	347,000	0
Deferred financing cost	(2,980)	(8,962)	0
Payment for interest rate cap	0	(1,100)	0
Excess tax benefits on stock based compensation	4,220	0	2,279
Proceeds from exercises of stock options	5,876	12,855	42,661
Repurchase of outstanding common stock	(30,000)	(7,769)	(50,665)
Payment of long term debt	(368,501)	(16,875)	0
Net cash (used in) provided by financing activities	(64,041)	325,149	(5,725)
Effect of exchange rate increase (decrease) on cash and cash equivalents	0	65	(4)
Net increase (decrease) in cash and cash equivalents	20,002	(3,830)	108,003
Cash and cash equivalents at beginning of period	223,192	227,022	119,019
Cash and cash equivalents at end of period	243,194	223,192	227,022
Supplemental disclosure of cash flow information
Income taxes paid	7,227	5,029	4,059
Interest paid	$ 8,727	$ 10,556	$ 0