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Stock-Based Compensation Plans (Tables)
6 Months Ended
Oct. 01, 2011
Stock-Based Compensation Plans [Abstract] 
Stock-Based compensation expense
                                 
    Three Months Ended     Six Months Ended  
    October 1,     October 2,     October 1,     October 2,  
(In thousands)   2011     2010     2011     2010  
Stock-based compensation included in:
                               
Cost of revenues
  $ 1,284     $ 1,312     $ 2,594     $ 2,579  
Research and development
    8,103       7,341       14,590       14,545  
Selling, general and administrative
    7,512       6,768       13,482       13,417  
 
                       
 
  $ 16,899     $ 15,421     $ 30,666     $ 30,541  
 
                       
Summary of option plans activity
                 
    Options Outstanding  
            Weighted-  
            Average  
    Number of     Exercise Price  
(Shares in thousands)   Shares     Per Share  
April 3, 2010
    31,026     $ 30.51  
Granted
    2,345     $ 26.36  
Exercised
    (5,704 )   $ 25.42  
Forfeited/cancelled/expired
    (2,698 )   $ 50.69  
 
             
April 2, 2011
    24,969     $ 29.11  
Granted
    57     $ 33.58  
Exercised
    (1,959 )   $ 24.93  
Forfeited/cancelled/expired
    (2,344 )   $ 36.86  
 
             
October 1, 2011
    20,723     $ 28.63  
 
             
Options exercisable at:
               
October 1, 2011
    17,613     $ 29.35  
April 2, 2011
    20,837     $ 30.08  
Summary of restricted stock unit activity and related information
                 
    RSUs Outstanding  
            Weighted-  
            Average Grant-  
    Number of     Date Fair Value  
(Shares in thousands)   Shares     Per Share  
April 3, 2010
    3,652     $ 21.70  
Granted
    2,043     $ 25.14  
Vested
    (1,192 )   $ 22.23  
Cancelled
    (288 )   $ 21.99  
 
             
April 2, 2011
    4,215     $ 23.19  
Granted
    2,128     $ 34.13  
Vested
    (1,166 )   $ 23.03  
Cancelled
    (249 )   $ 26.95  
 
             
October 1, 2011
    4,928     $ 27.91  
 
             
Weighted-average assumptions in estimation of fair value of employee purchase plan
                 
    2012     2011  
Expected life of options (years)
    1.25       1.25  
Expected stock price volatility
    0.29       0.33  
Risk-free interest rate
    0.2 %     0.3 %
Dividend yield
    2.4 %     2.3 %
Employee Stock Option [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 
Weighted-average assumptions in estimation of fair value of stock options
                                 
    Three Months Ended     Six Months Ended  
    October 1,     October 2,     October 1,     October 2,  
    2011     2010     2011     2010  
Expected life of options (years)
    5.2       5.1       5.2       5.1  
Expected stock price volatility
    0.34       0.36       0.31       0.36  
Risk-free interest rate
    1.2 %     1.8 %     1.7 %     1.8 %
Dividend yield
    2.3 %     2.5 %     2.3 %     2.5 %
Restricted Stock Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 
Weighted-average assumptions in estimation of fair value of restricted stock units
                                 
    Three Months Ended     Six Months Ended  
    October 1,     October 2,     October 1,     October 2,  
    2011     2010     2011     2010  
Risk-free interest rate
    0.7 %     1.0 %     0.8 %     1.0 %
Dividend yield
    2.1 %     2.5 %     2.1 %     2.5 %