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Stock Based Compensation (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 28, 2013
Jul. 29, 2012
Jul. 28, 2013
Jul. 29, 2012
Share-based Compensation        
Cost of revenue $ 2,168,000 $ 2,649,000 $ 4,821,000 $ 5,175,000
Research and development 18,555,000 18,885,000 40,490,000 40,092,000
Sales, general and administrative 11,672,000 10,721,000 20,481,000 22,557,000
Stock based compensation expense 32,395,000 32,255,000 65,792,000 67,824,000
Stock Options granted (in shares) 500 700 3,280 3,600
Weighted average grant-date fair value per option $ 2.96 $ 4.80 $ 3.09 $ 5.16
Restricted stock units granted (in shares) 700 700 5,558 4,000
Weighted average grant-date fair value of RSU's $ 13.49 $ 12.37 $ 11.93 $ 14.23
Stock-based compensation expense related to equity awards not expected to vest 1,800,000 2,100,000 13,700,000 13,600,000
Aggregate amount of unearned stock-based compensation expense related to equity awards, adjusted for estimated forfeitures 222,800,000 197,400,000 222,800,000 197,400,000
Unearned stock-based compensation expense related to stock options weighted average amortization period (in years)     2 years 7 months 6 days 2 years 7 months 6 days
Unearned stock-based compensation expense related to RSUs weighted average amortization period (in years)     2 years 9 months 17 days 2 years 7 months 6 days
Stock Options        
Stock options beginning balance (in shares)     32,995  
Stock Options granted (in shares) 500 700 3,280 3,600
Stock options exercised (in shares)     (1,176)  
Stock options cancelled (in shares)     (2,408)  
Stock options ending balance (in shares) 32,691   32,691  
Weighted average exercise price of stock options at beginning of period     $ 14.66  
Weighted average exercise price of stock options granted     $ 12.90  
Weighted average exercise price of stock options exercised     $ 9.57  
Weighted average exercise price of stock options cancelled     $ 19.89  
Weighted average exercise price of stock options at end of period $ 14.28   $ 14.28  
Restricted Stock Units        
Restricted stock units beginning balance (in shares)     15,159  
Restricted stock units granted (in shares) 700 700 5,558 4,000
Restricted stock units vested (in shares)     (3,259)  
Restricted stock units cancelled (in shares)     (628)  
Restricted stock units ending balance (in shares) 16,830   16,830  
Weighted average grant date fair value of restricted stock units at beginning of period     $ 14.46  
Weighted average grant-date fair value of RSU's $ 13.49 $ 12.37 $ 11.93 $ 14.23
Weighted average exercise price of stock options exercised     $ 15.43  
Weighted average grant date fair value of restricted stock units cancelled     $ 13.89  
Weighted average grant date fair value of restricted stock units at end of period $ 13.46   $ 13.46  
Minimum
       
Share-based Compensation        
Weighted average expected life (in years) 2 years 4 months 24 days 3 years 1 month 6 days 2 years 4 months 24 days 3 years 1 month 6 days
Maximum
       
Share-based Compensation        
Weighted average expected life (in years) 3 years 4 months 24 days 4 years 9 months 17 days 3 years 4 months 24 days 4 years 9 months 17 days
Stock Options
       
Share-based Compensation        
Estimated grant-date fair value 1,400,000 3,100,000 10,100,000 19,300,000
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)
Risk free interest rate, minimum (in hundredths) 1.80% 1.50% 1.80% 1.50%
Risk free interest rate, maximum (in hundredths) 2.70% 1.90% 2.70% 2.30%
Volatility rate, minimum (in hundredths) 30.00% 43.00% 30.00% 43.00%
Volatility rate, maximum (in hundredths) 33.00% 48.00% 37.00% 48.00%
Dividend yield minimum 2.10% 0.00% 2.10% 0.00%
Dividend yield maximum 2.20% 0.00% 2.40% 0.00%
Restricted Stock Units (RSUs)
       
Share-based Compensation        
Estimated grant-date fair value $ 8,900,000 $ 8,300,000 $ 66,300,000 $ 56,500,000
Employee Stock Purchase Plan
       
Share-based Compensation        
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)
Risk free interest rate, minimum (in hundredths) 0.00% 0.00% 0.10% 0.10%
Risk free interest rate, maximum (in hundredths) 0.00% 0.00% 0.30% 0.30%
Volatility rate, minimum (in hundredths) 0.00% 0.00% 37.00% 44.00%
Volatility rate, maximum (in hundredths) 0.00% 0.00% 37.00% 44.00%
Dividend Yield 0.00% 0.00% 2.40% 0.00%
Employee Stock Purchase Plan | Minimum
       
Share-based Compensation        
Weighted average expected life (in years) 0 years 0 months 0 days 0 years 0 months 0 days 0 years 6 months 0 days 0 years 6 months 0 days
Employee Stock Purchase Plan | Maximum
       
Share-based Compensation        
Weighted average expected life (in years) 0 years 0 months 0 days 0 years 0 months 0 days 2 years 0 months 0 days 2 years 0 months 0 days