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Stock Based Compensation (Details) (USD $)
12 Months Ended
Jan. 29, 2012
Jan. 30, 2011
Jan. 31, 2010
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan      
Cost of revenue $ 11,322,000 $ 8,308,000 $ 12,050,000
Research and development 80,502,000 57,974,000 61,337,000
Sales, general and administrative 44,530,000 34,071,000 33,704,000
Share-based Compensation 136,354,000 100,353,000 107,091,000
Stock Options granted (in shares) 6,430,778 5,818,966 7,701,396
Estimated grant-date fair value of stock options 52,400,000 34,400,000 44,200,000
Weighted average grant-date fair value per option $ 8.16 $ 5.89 $ 5.74
Restricted stock units granted (in shares) 7,336,776 7,104,693 7,672,899
Estimated grant-date fair value of RSU's 119,700,000 96,700,000 94,100,000
Weighted average grant date fair value of restricted stock units granted $ 16.31 $ 13.61 $ 12.26
Stock-based compensation expense related to equity awards not expected to vest 30,800,000 23,500,000 25,700,000
Aggregate amount of unearned stock-based compensation expense related to equity awards, adjusted for estimated forfeitures 185,800,000 147,100,000  
Unearned stock-based compensation expense related to stock options weighted average amortization period (in years) 2.5 1.7  
Unearned stock-based compensation expense related to RSUs weighted average amortization period (in years) 2.5 2.4  
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount $ 100,000 $ 700,000  
Stock Options Cancelled Related To Stock Option Purchase     (28,532,050)
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)
Weighted average expected life of stock options (in years), minimum 3.0 3.1 3.7
Weighted average expected life of stock options (in years), maximum 5.4 6.7 5.8
Risk free interest rate, minimum (in hundredths) 1.90% 1.50% 1.80%
Risk free interest rate, maximum (in hundredths) 3.80% 3.30% 2.90%
Volatility rate, minimum (in hundredths) 46.00% 42.00% 45.00%
Volatility rate, maximum (in hundredths) 65.00% 53.00% 72.00%
Dividend Yield 0 0 0
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 the Black-Scholes model) (Using the Black-Scholes model) (Using the Black-Scholes model)
Weighted average expected life of stock options (in years), minimum 0.5 0.5 0.5
Weighted average expected life of stock options (in years), maximum 2.0 2.0 2.0
Risk free interest rate, minimum (in hundredths) 0.10% 0.20% 0.20%
Risk free interest rate, maximum (in hundredths) 0.70% 0.80% 1.00%
Volatility rate, minimum (in hundredths) 57.00% 45.00% 53.00%
Volatility rate, maximum (in hundredths) 61.00% 47.00% 73.00%
Dividend Yield 0 0 0