Stock Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Oct. 30, 2011	Oct. 31, 2010	Oct. 30, 2011	Oct. 31, 2010
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan
Cost of revenue	$ 3,049,000	$ 2,490,000	$ 8,274,000	$ 6,582,000
Research and development	19,308,000	14,104,000	59,594,000	43,251,000
Sales, general and administrative	10,872,000	8,585,000	33,050,000	25,155,000
Stock Options granted (in shares)	3,000	3,000	6,271	5,700
Estimated grant-date fair value of stock options	21,800,000	13,700,000	51,400,000	33,500,000
Weighted average grant-date fair value per option	$ 7.35	$ 4.60	$ 8.20	$ 5.90
Restricted stock units granted (in shares)	3,100	3,900	6,802	6,800
Estimated grant-date fair value of RSU's	43,900,000	40,800,000	111,800,000	91,900,000
Weighted average grant date fair value of restricted stock units granted	$ 14.34	$ 10.53	$ 16.43	$ 13.50
Stock-based compensation expense related to equity awards not expected to vest	11,800,000		29,200,000
Aggregate amount of unearned stock-based compensation expense related to equity awards, adjusted for estimated forfeitures	$ 206,100,000	$ 164,700,000	$ 206,100,000	$ 164,700,000
Unearned stock-based compensation expense related to stock options weighted average amortization period (in years)			2.7	1.8
Unearned stock-based compensation expense related to RSUs weighted average amortization period (in years)			2.7	2.6
Stock Options
Stock options beginning balance (in shares)			44,001
Stock Options granted (in shares)	3,000	3,000	6,271	5,700
Stock options exercised (in shares)			(13,714)
Stock options cancelled (in shares)			(1,514)
Stock options ending balance (in shares)	35,044		35,044
Weighted average exercise price of stock options at beginning of period			$ 12.88
Weighted average exercise price of stock options granted	$ 16.22		$ 16.22
Weighted average exercise price of stock options exercised	$ 10.69		$ 10.69
Weighted average exercise price of stock options cancelled			$ 14.61
Weighted average exercise price of stock options at end of period	$ 14.26		$ 14.26
Restricted Stock Units
Restricted stock units beginning balance (in shares)			10,612
Restricted stock units granted (in shares)	3,100	3,900	6,802	6,800
Restricted stock units vested (in shares)			(3,441)
Restricted stock units cancelled (in shares)			(713)
Restricted stock units ending balance (in shares)	13,260		13,260
Weighted average grant date fair value of restricted stock units at beginning of period			$ 13.23
Weighted average grant date fair value of restricted stock units granted	$ 14.34	$ 10.53	$ 16.43	$ 13.50
Weighted average exercise price of stock options exercised			$ 12.02
Weighted average grant date fair value of restricted stock units cancelled	$ 14.62		$ 14.62
Weighted average grant date fair value of restricted stock units at end of period	$ 15.11		$ 15.11
Stock Options
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used	(Using a binomial model)	(Using a binomial model)	(Using a binomial model)	(Using a binomial model)
Weighted average expected life of stock options (in years), minimum	4.1	4.0	3.6	3.1
Weighted average expected life of stock options (in years), maximum	4.9	5.5	5.4	6.7
Risk free interest rate, minimum (in hundredths)	1.90%	1.90%	1.90%	1.90%
Risk free interest rate, maximum (in hundredths)	2.40%	2.70%	3.80%	3.00%
Volatility rate, minimum (in hundredths)	58.00%	46.00%	46.00%	43.00%
Volatility rate, maximum (in hundredths)	65.00%	47.00%	65.00%	53.00%
Employee Stock Purchase Plan
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used	(Using a Black-Scholes model)	(Using a Black-Scholes model)	(Using a Black-Scholes model)	(Using a Black-Scholes model)
Weighted average expected life of stock options (in years), minimum	0.5	0.5	0.5	0.5
Weighted average expected life of stock options (in years), maximum	2.0	2.0	2.0	2.0
Risk free interest rate, minimum (in hundredths)	0.10%	0.20%	0.10%	0.20%
Risk free interest rate, maximum (in hundredths)	0.20%	0.50%	0.70%	0.80%
Volatility rate, minimum (in hundredths)	61.00%	47.00%	57.00%	45.00%
Volatility rate, maximum (in hundredths)			61.00%	47.00%

Represents the stock-based compensation expense recognized during the period in cost of revenue on the consolidated statement of operations net of amounts capitalized during the period.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The maximum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The minimum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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