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Share-Based Compensation Expense (Tables)
9 Months Ended
Jul. 31, 2011
Share-Based Compensation Expense [Abstract]  
Summary of stock option activity
                 
    Shares Underlying     Weighted  
    Options     Average  
    Outstanding     Exercise Price  
Balance as of October 31, 2010
    5,002     $ 40.96  
Granted
           
Exercised
    (405 )     15.03  
Canceled
    (442 )     87.94  
 
             
Balance as of July 31, 2011
    4,155     $ 38.49  
 
             
Summarizes information with respect to stock options outstanding
                                                                                 
                    Options Outstanding at July 31, 2011     Vested Options at July 31, 2011  
                            Weighted                             Weighted              
                            Average                             Average              
                            Remaining     Weighted                     Remaining     Weighted        
Range of     Number     Contractual     Average     Aggregate     Number     Contractual     Average     Aggregate  
Exercise     of     Life     Exercise     Intrinsic     of     Life     Exercise     Intrinsic  
Price     Shares     (Years)     Price     Value     Shares     (Years)     Price     Value  
$0.01
        $ 16.52       635       5.41     $ 11.37     $ 2,852       511       4.82     $ 11.68     $ 2,188  
$16.53
        $ 17.43       351       4.12       17.20             337       3.99       17.20        
$17.44
        $ 22.96       339       3.75       21.80             326       3.61       21.85        
$22.97
        $ 31.71       1,253       3.36       29.42             1,226       3.29       29.45        
$31.72
        $ 46.90       755       4.67       39.25             712       4.57       39.40        
$46.91
        $ 73.78       399       1.37       59.14             399       1.37       59.14        
$73.79
        $ 267.52       423       0.22       116.21             423       0.22       116.21        
 
                                                                       
$0.01
        $ 267.52       4,155       3.50     $ 38.49     $ 2,852       3,934       3.28     $ 39.61     $ 2,188  
 
                                                                       
Weighted average assumptions for option-based awards
                 
    Quarter Ended     Nine Months Ended  
    July 31,     July 31,  
    2010     2010  
Expected volatility
    61.9 %     61.9 %
Risk-free interest rate
    2.4 %     2.4 - 3.0 %
Expected life (years)
    5.3 - 5.5       5.3 - 5.5  
Expected dividend yield
    0.0 %     0.0 %
Weighted average assumptions for ESPP option-based awards
                 
    Quarter Ended     Nine Months Ended  
    July 31,     July 31,  
    2011     2011  
Expected volatility
    39.8 - 48.4 %     39.8 - 49.1 %
Risk-free interest rate
    0.19 - .20 %     0.19 - .64 %
Expected life (years)
    0.5       0.25 - 0.50  
Expected dividend yield
    0.0 %     0.0 %
Summary of Restricted Stock Unit Activity
                         
            Weighted        
    Restricted     Average Grant        
    Stock Units     Date Fair Value     Aggregate  
    Outstanding     Per Share     Fair Value  
Balance as of October 31, 2010
    5,191     $ 13.81     $ 71,681  
Granted
    1,855                  
Vested
    (1,916 )                
Canceled or forfeited
    (483 )                
 
                     
Balance as of July 31, 2011
    4,647     $ 16.12     $ 71,849  
 
                     
Share-based compensation expense
                                 
    Quarter Ended July 31,     Nine Months Ended July 31,  
    2010     2011     2010     2011  
Product costs
  $ 548     $ 578     $ 1,475     $ 1,658  
Service costs
    432       510       1,315       1,516  
 
                       
Share-based compensation expense included in cost of sales
    980       1,088       2,790       3,174  
 
                       
 
                               
Research and development
    2,302       2,423       6,948       7,591  
Sales and marketing
    2,902       2,737       8,025       8,871  
General and administrative
    2,473       2,883       7,349       8,023  
Acquisition and integration costs
    883       54       1,229       288  
 
                       
Share-based compensation expense included in operating expense
    8,560       8,097       23,551       24,773  
 
                       
 
                               
Share-based compensation expense capitalized in inventory, net
    111       (152 )     110       (28 )
 
                       
 
                               
Total share-based compensation
  $ 9,651     $ 9,033     $ 26,451     $ 27,919