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Stock Based Compensation (Details) (USD $)
3 Months Ended 12 Months Ended
Apr. 27, 2014
Apr. 28, 2013
Jan. 26, 2014
Share-based Compensation      
Cost of revenue $ 2,919,000 $ 2,653,000  
Research and development 20,494,000 21,935,000  
Sales, general and administrative 12,108,000 8,809,000  
Stock based compensation expense 35,521,000 33,397,000  
Stock Options granted (in shares) 7,800 2,800,000  
Weighted average grant-date fair value per option $ 4.60 $ 3.11  
RSUs and PSUs granted (in shares) 3,254,000 [1] 4,900,000  
Weighted average grant-date fair value of RSUs and PSUs $ 17.13 $ 11.72  
Stock-based compensation expense related to equity awards not expected to vest 10,000,000 11,800,000  
Aggregate amount of unearned stock-based compensation expense related to equity awards, adjusted for estimated forfeitures 259,600,000   241,300,000
Unearned stock-based compensation expense related to stock options weighted average amortization period (in years) 2 years 3 months 17 days   2 years 6 months 0 days
Unearned stock-based compensation expense related to RSUs/PSUs weighted average amortization period (in years) 2 years 9 months 17 days   2 years 8 months 12 days
Stock Options      
Stock options beginning balance (in shares) 32,504,000    
Stock Options granted (in shares) 7,800 2,800,000  
Stock options exercised (in shares) (4,801,000)    
Stock options cancelled (in shares) (486,000)    
Stock options ending balance (in shares) 27,225,000   32,504,000
Weighted average exercise price of stock options at beginning of period $ 14.22    
Weighted average exercise price of stock options granted $ 17.20    
Weighted average exercise price of stock options exercised $ 13.14    
Weighted average exercise price of stock options cancelled $ 20.31    
Weighted average exercise price of stock options at end of period $ 14.30   $ 14.22
RSUs/PSUs      
RSUs/PSUs beginning balance (in shares) 18,852,000    
RSUs and PSUs granted (in shares) 3,254,000 [1] 4,900,000  
RSUs/PSUs vested (in shares) (3,303,000)    
RSUs/PSUs cancelled (in shares) (367,000)    
RSUs/PSUs ending balance (in shares) 18,436,000   18,852,000
Weighted average grant date fair value of RSUs/PSUs at beginning of period $ 13.82    
Weighted average grant-date fair value of RSUs and PSUs $ 17.13 $ 11.72  
Weighted average grant-date fair value of RSUs/PSUs vested $ 13.31    
Weighted average grant date fair value of RSUs/PSUs cancelled $ 13.24    
Weighted average grant date fair value of RSUs/PSUs at end of period $ 14.51   $ 13.82
Maximum number of PSUs issuable 2,500,000    
Minimum number of PSUs issuable 0    
Minimum
     
Share-based Compensation      
Weighted average expected life (in years) 3 years 2 months 12 days 3 years 2 months 12 days  
Maximum
     
Share-based Compensation      
Weighted average expected life (in years) 3 years 2 months 12 days 3 years 3 months 17 days  
Stock Options
     
Share-based Compensation      
Estimated grant-date fair value 35,880 8,700,000  
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) 2.80% 1.80%  
Risk free interest rate, maximum (in hundredths) 2.80% 2.10%  
Volatility rate, minimum (in hundredths) 31.00% 32.00%  
Volatility rate, maximum (in hundredths) 31.00% 37.00%  
Dividend yield minimum 1.90% 2.30%  
Dividend yield maximum 1.90% 2.40%  
RSUs and PSUs
     
Share-based Compensation      
Estimated grant-date fair value $ 55,700,000 $ 57,400,000  
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)  
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) 31.00% 37.00%  
Volatility rate, maximum (in hundredths) 31.00% 37.00%  
Dividend yield minimum 1.90% 2.40%  
Dividend yield maximum 1.90% 2.40%  
Employee Stock Purchase Plan | Minimum
     
Share-based Compensation      
Weighted average expected life (in years) 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) 2 years 0 months 0 days 2 years 0 months 0 days  
[1] Includes the total number of PSUs issuable if the maximum corporate financial performance target level for fiscal year 2015 is achieved. Depending on the actual level of achievement of the corporate performance goal at the end of fiscal year 2015, the range of PSUs issued could range from 0 to 2.5 million shares.