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Stock Based Compensation (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Apr. 28, 2013
Apr. 29, 2012
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan    
Cost of revenue $ 2,653,000 $ 2,526,000
Research and development 21,935,000 21,207,000
Sales, general and administrative 8,809,000 11,836,000
Stock based compensation expense 33,397,000 35,569,000
Stock Options granted (in shares) 2,808 2,900
Weighted average grant-date fair value per option $ 3.11 $ 5.52
Restricted stock units granted (in shares) 4,898 3,300
Weighted average grant-date fair value of RSU's $ 11.72 $ 14.58
Stock-based compensation expense related to equity awards not expected to vest 11,800,000 11,500,000
Aggregate amount of unearned stock-based compensation expense related to equity awards, adjusted for estimated forfeitures 238,400,000 212,900,000
Unearned stock-based compensation expense related to stock options weighted average amortization period (in years) 2 years 9 months 21 days 2 years 8 months 12 days
Unearned stock-based compensation expense related to RSUs weighted average amortization period (in years) 3 years 0 months 14 days 2 years 9 months 17 days
Stock Options    
Stock options beginning balance (in shares) 32,995  
Stock Options granted (in shares) 2,808 2,900
Stock options exercised (in shares) (352)  
Stock options cancelled (in shares) (1,703)  
Stock options ending balance (in shares) 33,748  
Weighted average exercise price of stock options at beginning of period $ 14.66  
Weighted average exercise price of stock options granted $ 12.62  
Weighted average exercise price of stock options exercised $ 8.41  
Weighted average exercise price of stock options cancelled $ 19.52  
Weighted average exercise price of stock options at end of period $ 14.31  
Restricted Stock Units    
Restricted stock units beginning balance (in shares) 15,159  
Restricted stock units granted (in shares) 4,898 3,300
Restricted stock units vested (in shares) (3,238)  
Restricted stock units cancelled (in shares) (242)  
Restricted stock units ending balance (in shares) 16,577  
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 $ 11.72 $ 14.58
Weighted average exercise price of stock options exercised $ 15.45  
Weighted average grant date fair value of restricted stock units cancelled $ 14.08  
Weighted average grant date fair value of restricted stock units at end of period $ 13.46  
Minimum [Member]
   
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan    
Weighted average expected life (in years) 3 years 2 months 12 days 4 years 2 months 12 days
Maximum [Member]
   
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan    
Weighted average expected life (in years) 3 years 3 months 17 days 4 years 8 months 12 days
Stock Options
   
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan    
Estimated grant-date fair value 8,700,000 16,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used (Using a binomial model) (Using a binomial model)
Risk free interest rate, minimum (in hundredths) 1.80% 2.00%
Risk free interest rate, maximum (in hundredths) 2.10% 2.30%
Volatility rate, minimum (in hundredths) 32.00% 43.00%
Volatility rate, maximum (in hundredths) 37.00% 46.00%
Dividend yield minimum 2.30%  
Dividend yield maximum 2.40%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   0.00%
Restricted Stock Units (RSUs) [Member]
   
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan    
Estimated grant-date fair value $ 57,400,000 $ 48,200,000
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)
Risk free interest rate, minimum (in hundredths) 0.10% 0.10%
Risk free interest rate, maximum (in hundredths) 0.30% 0.30%
Volatility rate, minimum (in hundredths) 37.00% 44.00%
Volatility rate, maximum (in hundredths) 37.00% 44.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 2.40% 0.00%
Employee Stock Purchase Plan | Minimum [Member]
   
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan    
Weighted average expected life (in years) 0 years 6 months 0 days 0 years 6 months 0 days
Employee Stock Purchase Plan | Maximum [Member]
   
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan    
Weighted average expected life (in years) 2 years 0 months 0 days 2 years 0 months 0 days