Income Taxes (Details) (USD $)	12 Months Ended
	Jan. 27, 2013	Jan. 29, 2012	Jan. 30, 2011	Jan. 31, 2010
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ 710,400,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	762,900,000
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	370,400,000
Net operating loss carryforwards	84,156,000	99,518,000
Accruals and reserves, not currently deductible for tax purposes	121,644,000	109,245,000
Property, equipment and intangible assets	54,636,000	40,245,000
Research and other tax credit carryforwards	271,933,000	232,001,000
Stock-based compensation	34,187,000	38,177,000
Gross deferred tax assets	566,556,000	519,186,000
Less: valuation allowance	(224,774,000)	(212,285,000)
Deferred Tax Assets, Net	341,782,000	306,901,000
Deferred Tax Liabilities Intangible Assets	(43,878,000)	(53,120,000)
Unremitted earnings of foreign subsidiaries	(383,591,000)	(329,679,000)
Deferred Tax Liabilities, Gross	(427,469,000)	(382,799,000)
Net deferred tax asset (liability)	(85,687,000)	(75,898,000)
India Tax Holiday			1,300,000
Undistributed Earnings Of Non United States Subsidiaries	1,680,000,000
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	7,506,000	7,099,000	141,000
State	1,016,000	789,000	(511,000)
Foreign	16,766,000	7,630,000	6,827,000
Total current	25,288,000	15,518,000	6,457,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	28,143,000	25,111,000	(3,063,000)
State	0	0	0
Foreign	3,717,000	(6,055,000)	417,000
Total deferred	31,860,000	19,056,000	(2,646,000)
Charge in lieu of taxes attributable to employer stock option plans	42,355,000	47,732,000	14,212,000
Income tax expense	99,503,000	82,306,000	18,023,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Domestic	99,422,000	120,768,000	82,531,000
Foreign	562,617,000	542,628,000	188,638,000
Income before income tax	662,039,000	663,396,000	271,169,000
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax expense computed at federal statutory rate	231,714,000	232,189,000	94,909,000
State income taxes, net of federal tax effect	(1,048,000)	(2,302,000)	(391,000)
Foreign tax rate differential	(123,626,000)	(142,071,000)	(49,585,000)
Research tax credit	(29,294,000)	(24,270,000)	(28,729,000)
Stock-based compensation	11,876,000	10,983,000	1,668,000
Other	7,785,000	3,173,000	151,000
Foreign Credit Carryforward to be refunded in 2016	3,000,000
Foreign Credit Carryforward to be refunded in 2017	4,900,000
Effective tax rate	15.00%	12.40%	6.70%
Unrecognized Tax Benefits	220,543,000	138,262,000	121,034,000	109,765,000
United States federal statutory rate	35.00%
Excess Tax Benefit Related To StockBasedCompensation	459,100,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	200,900,000
Accrued Income Taxes, Noncurrent	115,267,000	63,007,000
Unrecognized tax benefit (non current)	104,000,000
Reduction of deferred tax asset included in unrecognized tax benefit	96,900,000
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Dates	2022
Deferred Tax Assets, Tax Credit Carryforwards, Research	351,000,000
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Dates	2014
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax Credit Carryforward, Deferred Tax Asset	200,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Dates	2014
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax Credit Carryforward, Deferred Tax Asset	35,500,000
GERMANY
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	80,000,000
UNITED KINGDOM
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	262,900,000
CANADA
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	22,700,000
Othe state tax credit carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Dates	2026
Deferred Tax Assets, Tax Credit Carryforwards, Other	2,600,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	10,400,000
California Research Credit [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Research	321,500,000
Non California Research Credit [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Dates	2014
Research [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Dates	2018
Other federal tax credit carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Dates	2014
Deferred Tax Assets, Tax Credit Carryforwards, Other	1,500,000
other foreign tax credit carryforward [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Other	7,900,000
State Research Credit [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 331,900,000