CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 29, 2012	Jan. 30, 2011	Jan. 31, 2010
Cash flows from operating activities:
Net income (loss)	$ 581,090	$ 253,146	$ (67,987)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation expense related to stock option purchase	0	0	135,735
Depreciation and amortization	204,205	186,989	196,664
Share-based Compensation	136,354	100,353	107,091
Deferred income taxes	19,056	(2,646)	(21,147)
Excess Tax benefit from stock based compensation	(52,793)	(15,316)	(2,034)
Other	19,095	1,572	3,070
Changes in operating assets and liabilities
Accounts receivable	26,236	26,341	(56,741)
Inventories	18,884	(14,128)	204,656
Prepaid expenses and other current assets	(14,803)	8,528	1,580
Deposits and other assets	(70,694)	4,331	3,857
Accounts payable	35,708	(69,786)	119,366
Accrued liabilities and other long-term liabilities	6,818	196,413	(136,303)
Net cash provided by operating activities, net of effect of acquisition	909,156	675,797	487,807
Cash flows from investing activities:
Purchases of marketable securities	(1,964,898)	(1,719,700)	(1,193,948)
Proceeds from sales and maturities of marketable securities	1,310,743	1,170,075	752,434
Purchases of property and equipment and intangible assets	(138,735)	(97,890)	(77,601)
Acquisition of businesses, net of cash acquired	(348,884)	0	0
Other	(1,590)	(2,163)	(218)
Net cash used in investing activities	(1,143,364)	(649,678)	(519,333)
Cash flows from financing activities:
Payments related to stock option purchase	0	0	(78,075)
Proceeds from issuance of stock under employee stock plans	195,857	177,276	138,029
Payments under capital lease obligations	(1,608)	(571)	(929)
Excess Tax benefit from Stock based compensation	52,793	15,316	2,034
Payment of notes payable assumed from acquisitions	(10,319)	0	0
Net cash provided by financing activities	236,723	192,021	61,059
Change in cash and cash equivalents	2,515	218,140	29,533
Cash and cash equivalents at beginning of period	665,361	447,221	417,688
Cash and cash equivalents at end of period	667,876	665,361	447,221
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net	58,328	(1,071)	4,217
Cash paid for interest on capital lease obligations	3,008	3,127	3,256
Other non-cash activities:
Change in unrealized gain (loss) from marketable securities	342	(1,899)	8,305
Assets acquired by assuming related liabilities	$ 15,913	$ 252,796	$ 37,830