CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 28, 2013	Apr. 29, 2012
Cash flows from operating activities:
Net income	$ 77,891	$ 60,437
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	59,744	54,491
Stock based compensation expense	33,397	35,569
Deferred income taxes	(3,063)	3,630
Excess Tax benefit from stock based compensation	(10,120)	(8,675)
Other	4,988	5,451
Changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	108,476	(75,369)
Inventories	41,510	(2,191)
Prepaid expenses and other current assets	7,367	(48,100)
Other assets	1,806	(1,882)
Accounts payable	(53,101)	33,516
Accrued liabilities and other long-term liabilities	(93,245)	(66,085)
Net cash provided by (used in) operating activities	175,650	(9,208)
Cash flows from investing activities:
Purchases of marketable securities	(541,950)	(814,222)
Proceeds from sales and maturities of marketable securities	378,281	507,875
Purchases of property and equipment and intangible assets	(65,667)	(28,923)
Acquisition of businesses, net of cash acquired	0	0
Other	(1,450)	216
Net cash used in investing activities	(230,786)	(335,054)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans	22,996	37,361
Payments under capital lease obligations	(576)	(515)
Excess Tax benefit from Stock based compensation	10,120	8,675
Payments for Repurchase of Common Stock	(100,000)	0
Dividend paid	(46,267)	0
Other Financing Activities	(2,500)	0
Net cash provided by (used in) financing activities	(116,227)	45,521
Change in cash and cash equivalents	(171,363)	(298,741)
Cash and cash equivalents at beginning of period	732,786	667,876
Cash and cash equivalents at end of period	561,423	369,135
Supplemental disclosures of cash flow information:
Cash paid or received for income taxes, net	2,286	2,010
Cash paid for interest on capital lease obligations	655	744
Other non-cash activities:
Assets acquired by assuming related liabilities	41,341	55,256
Change in unrealized gains (losses) from marketable securities	$ 312	$ (167)