CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 27, 2014	Apr. 28, 2013
Cash flows from operating activities:
Net income	$ 136,516	$ 77,891
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	55,083	59,744
Stock based compensation expense	35,521	33,397
Amortization of Debt Discount	6,901	0
Gains on Sales of long-lived assets and investment	(16,982)	0
Deferred income taxes	21,464	(3,063)
Tax benefits from stock based compensation	(4,086)	(10,120)
Other	7,281	4,988
Changes in operating assets and liabilities:
Accounts receivable	28,077	108,476
Inventories	(5,679)	41,510
Prepaid expenses and other current assets	(782)	7,367
Deposits and other assets	229	1,806
Accounts payable	(14,880)	(53,101)
Accrued liabilities and other long-term liabilities	(97,641)	(93,245)
Net cash provided by operating activities	151,022	175,650
Cash flows from investing activities:
Purchases of marketable securities	(1,001,073)	(541,950)
Proceeds from sale of marketable securities	544,878	199,199
Proceeds from maturities of marketable securities	134,079	179,082
Proceeds from sale of long-lived assets and investments	20,862	0
Purchases of property and equipment and intangible assets	(29,068)	(65,667)
Other	0	(1,450)
Net cash used in investing activities	(330,322)	(230,786)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans	80,232	22,996
Payment under Capital Lease Obligations	(709)	(576)
Tax benefits from Stock based compensation	4,086	10,120
Payments for Repurchase of Common Stock	(500,000)	(100,000)
Dividend paid	(46,731)	(46,267)
Other Financing Activities	0	(2,500)
Net cash used in financing activities	(463,122)	(116,227)
Change in cash and cash equivalents	(642,422)	(171,363)
Cash and cash equivalents at beginning of period	1,151,587	732,786
Cash and cash equivalents at end of period	509,165	561,423
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net	2,410	2,286
Cash paid for interest on capital lease obligations	591	655
Other non-cash activities:
Assets acquired by assuming related liabilities	$ 2,824	$ 41,341