CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 28, 2013	Jul. 29, 2012
Cash flows from operating activities:
Net income	$ 174,339	$ 179,483
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	121,584	110,686
Stock based compensation expense	65,792	67,824
Deferred income taxes	(611)	13,791
Excess Tax benefit from stock based compensation	(17,360)	(18,154)
Other	8,867	32,496
Changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	37,271	(109,218)
Inventories	34,722	(46,834)
Prepaid expenses and other current assets	(4,956)	(3,912)
Other assets	4,445	494
Accounts payable	(36,452)	65,646
Accrued liabilities and other long-term liabilities	(115,522)	(100,624)
Net cash provided by operating activities	272,119	191,678
Cash flows from investing activities:
Purchases of marketable securities	(936,214)	(1,247,664)
Proceeds from sale of marketable securities	1,248,511	476,379
Proceeds from maturities of marketable securities	320,838	442,477
Purchases of property and equipment and intangible assets	(150,653)	(90,867)
Other	(1,450)	(82)
Net cash provided by (used in) investing activities	481,032	(419,757)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans	31,303	42,678
Payments under capital lease obligations	(1,169)	(1,011)
Excess Tax benefit from Stock based compensation	17,360	18,154
Payments for Repurchase of Common Stock	(850,000)	0
Dividend paid	(89,610)	0
Other Financing Activities	(2,500)	0
Net cash provided by (used in) financing activities	(894,616)	59,821
Change in cash and cash equivalents	(141,465)	(168,258)
Cash and cash equivalents at beginning of period	732,786	667,876
Cash and cash equivalents at end of period	591,321	499,618
Supplemental disclosures of cash flow information:
Cash paid or (received) for income taxes, net	5,083
Proceeds from Income Tax Refunds		(43,149)
Cash paid for interest on capital lease obligations	1,294	1,474
Other non-cash activities:
Assets acquired by assuming related liabilities	3,725	54,230
Change in unrealized gains (losses) from marketable securities	$ (4,084)	$ 545