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Stock Based Compensation (Details) (USD $)
12 Months Ended
Jan. 27, 2013
Jan. 29, 2012
Jan. 30, 2011
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan      
Stock Issued During Period, Shares, Employee Stock Purchase Plans 5,500,000 5,800,000 6,700,000
Cost of revenue $ 10,490,000 $ 11,322,000 $ 8,308,000
Research and development 82,157,000 80,502,000 57,974,000
Sales, general and administrative 44,015,000 44,530,000 34,071,000
Share-based Compensation 136,662,000 136,354,000 100,353,000
Stock Options granted (in shares) 7,119,319 6,430,778 5,818,966
Estimated grant-date fair value of stock options 38,300,000 52,400,000 34,400,000
Weighted average grant-date fair value per option $ 5.38 $ 8.16 $ 5.89
Restricted stock units granted (in shares) 8,135,658 7,336,776 7,104,693
Estimated grant-date fair value of RSU's 112,800,000 119,700,000 96,700,000
Weighted average grant date fair value of restricted stock units granted $ 13.86 $ 16.31 $ 13.61
Share Based Compensation Expense Related To Equity Awards Not Expected To Vest 27,100,000 30,800,000 23,500,000
Aggregate amount of unearned stock-based compensation expense related to equity awards, adjusted for estimated forfeitures 208,700,000 185,800,000  
Unearned stock-based compensation expense related to stock options weighted average amortization period (in years) 2.7 2.5  
Unearned stock-based compensation expense related to RSUs weighted average amortization period (in years) 2.7 2.5  
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 400,000 100,000 700,000
Fair Value of Options Vested In Period $ 40,300,000 $ 49,500,000 $ 60,700,000
Stock Options
     
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan      
Weighted average expected life of stock options (in years), minimum 3.1 3.0 3.1
Weighted average expected life of stock options (in years), maximum 4.9 5.4 6.7
Risk free interest rate, minimum (in hundredths) 1.50% 1.90% 1.50%
Risk free interest rate, maximum (in hundredths) 2.30% 3.80% 3.30%
Volatility rate, minimum (in hundredths) 39.00% 46.00% 42.00%
Volatility rate, maximum (in hundredths) 49.00% 65.00% 53.00%
Dividend Yield 2.40%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Range of Dividends Used   0 0
Employee Stock Purchase Plan
     
Fair value of stock options granted under stock option plans and shares issued under employee stock purchase plan      
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% 0.10% 0.20%
Risk free interest rate, maximum (in hundredths) 0.30% 0.70% 0.80%
Volatility rate, minimum (in hundredths) 44.00% 57.00% 45.00%
Volatility rate, maximum (in hundredths) 47.00% 61.00% 47.00%
Dividend Yield 0.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Range of Dividends Used   0 0