CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 27, 2014	Jul. 28, 2013
Cash flows from operating activities:
Net income	$ 264,492	$ 174,339
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	110,690	121,584
Stock based compensation expense	73,936	65,792
Amortization of Debt Discount	13,874	0
Gains on Sales of long-lived assets and investment	(14,482)	0
Deferred income taxes	38,313	(611)
Tax benefits from stock based compensation	(6,843)	(17,360)
Other	14,124	8,867
Changes in operating assets and liabilities:
Accounts receivable	(45,747)	37,271
Inventories	508	34,722
Prepaid expenses and other current assets	2,510	(4,956)
Deposits and other assets	1,028	4,445
Accounts payable	(63,648)	(36,452)
Accrued liabilities and other long-term liabilities	(141,451)	(115,522)
Net cash provided by operating activities	247,304	272,119
Cash flows from investing activities:
Purchases of marketable securities	(1,682,854)	(936,214)
Proceeds from sale of marketable securities	869,087	1,248,511
Proceeds from maturities of marketable securities	451,474	320,838
Proceeds from sale of long-lived assets and investments	20,862	0
Purchases of property and equipment and intangible assets	(51,595)	(150,653)
Other	(250)	(1,450)
Net cash provided by (used in) investing activities	(393,276)	481,032
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans	98,220	31,303
Payment under Capital Lease Obligations	(1,423)	(1,169)
Tax benefits from Stock based compensation	6,843	17,360
Payments for Repurchase of Common Stock	(500,000)	(850,000)
Dividend paid	(94,163)	(89,610)
Other Financing Activities	0	(2,500)
Net cash used in financing activities	(490,523)	(894,616)
Change in cash and cash equivalents	(636,495)	(141,465)
Cash and cash equivalents at beginning of period	1,151,587	732,786
Cash and cash equivalents at end of period	515,092	591,321
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net	6,766	5,083
Cash paid for interest	8,623	1,294
Other non-cash activities:
Assets acquired by assuming related liabilities	5,570	3,725
Change in unrealized losses from marketable securities	$ (499)	$ (4,084)