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Stockholders' Equity (Tables)
9 Months Ended
Jan. 27, 2012
Stockholders' Equity [Abstract]  
Combined Activity Under Stock Option Plans And Agreements
     Number
of  Shares
    Weighted-
Average
Exercise
Price
     Weighted-
Average
Remaining
Contractual Term
(Years)
     Aggregate
Intrinsic
Value
 
          
          
          
          

Outstanding at April 29, 2011

     24.5      $ 26.62         

Options granted

     2.1        51.36         

Options exercised

     (3.0     20.98         

Options forfeitures and cancellations

     (0.7     35.96         
  

 

 

         

Outstanding at January 27, 2012

     22.9        29.28         3.91       $ 239.6   
  

 

 

         

Options vested and expected to vest as of January 27, 2012

     22.1        28.86         3.86         236.7   

Exercisable at January 27, 2012

     15.1        25.64         3.25         188.9   
Additional Information Related To Stock Options
     Three Months Ended      Nine Months Ended  
     January 27,
2012
     January 28,
2011
     January 27,
2012
     January 28,
2011
 

Weighted-average fair value per share granted

   $ 13.26       $ 18.79       $ 16.88       $ 15.72   

Weighted-average fair value per share of options assumed in acquisition

     N/A         N/A         N/A       $ 21.15   

Intrinsic value of options exercised

   $ 21.0       $ 79.4       $ 71.6       $ 294.0   

Proceeds received from the exercise of stock options

   $ 19.5       $ 53.9       $ 62.2       $ 278.8   

Fair value of options vested

   $ 18.1       $ 23.1       $ 56.8       $ 77.5   
Activity Related To Restricted Stock Units (RSUs)
     Number of
Shares
    Weighted-
Average
Grant Date
Fair Value
 

Outstanding at April 29, 2011

     10.1      $ 35.79   

RSUs granted

     5.3        48.84   

RSUs vested

     (3.1     29.92   

RSUs forfeitures and cancellations

     (0.7     39.90   
  

 

 

   

Outstanding at January 27, 2012

     11.6        43.10   
  

 

 

   
Number And Value Of The Shares Netted For Employee Taxes
     Three Months Ended      Nine Months Ended  
     January 27,
2012
     January 28,
2011
     January 27,
2012
     January 28,
2011
 

Shares withheld for taxes

     0.4         0.3         1.0         0.8   

Fair value of shares withheld and retired

   $ 16.4       $ 15.9       $ 44.2       $ 35.5   
Schedule Of Employee Stock Purchase Plan (ESPP) Disclosures
     Three Months Ended      Nine Months Ended  
     January 27,
2012
     January 28,
2011
     January 27,
2012
     January 28,
2011
 

Weighted-average fair value per right granted

   $ 12.93       $ 16.54       $ 13.34       $ 15.35   

Shares issued under the ESPP

     1.5         3.2         2.6         6.0   

Weighted-average price per share issued

   $ 31.03       $ 11.87       $ 34.53       $ 11.50   
Stock-Based Compensation Expense
     Three Months Ended      Nine Months Ended  
     January 27,
2012
     January 28,
2011
     January 27,
2012
     January 28,
2011
 

Cost of product revenues

   $ 1.6       $ 1.0       $ 4.1       $ 2.7   

Cost of service revenues

     5.7         3.6         13.8         10.6   

Sales and marketing

     37.5         21.3         96.5         59.2   

Research and development

     22.8         11.3         57.0         31.6   

General and administrative

     9.1         7.8         26.4         22.9   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total stock-based compensation expense

   $ 76.7       $ 45.0       $ 197.8       $ 127.0   
  

 

 

    

 

 

    

 

 

    

 

 

 
Stock-Based Compensation Expense Associated With Each Type Of Award
     Three Months Ended      Nine Months Ended  
     January 27,
2012
     January 28,
2011
     January 27,
2012
     January 28,
2011
 

Employee stock options

   $ 13.8       $ 13.8       $ 43.0       $ 39.7   

RSUs and restricted stock awards

     42.1         23.9         115.4         61.7   

ESPP

     20.8         7.3         39.4         25.6   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total stock-based compensation expense

   $ 76.7       $ 45.0       $ 197.8       $ 127.0   
  

 

 

    

 

 

    

 

 

    

 

 

 
Income Tax Benefits Associated With Employee Stock Transactions
     Nine Months Ended  
     January 27,
2012
     January 28,
2011
 

Income tax benefits associated with employee stock transactions

   $ 74.7       $ 74.9   
Valuation Assumptions
Contracts' Value Allocated To Cost Of Shares Repurchased And To The Value Of The ASR Forward Contracts
     Shares of
Common
Stock
    Additional
Paid-in
Capital
    Retained
Earnings
    Total
Repurchase
Activity
 

Repurchase and retirement of common stock

     (14.6   $ (125.8   $ (474.1   $ (599.9

Value of ASR forward contracts

       (0.1       (0.1
  

 

 

   

 

 

   

 

 

   

 

 

 

Total cash payment

     (14.6   $ (125.9   $ (474.1   $ (600.0
  

 

 

   

 

 

   

 

 

   

 

 

 
Components Of Accumulated Other Comprehensive Income, Net Of Related Immaterial Tax Effects
     January 27,
2012
    April 29,
2011
 

Accumulated translation adjustments

   $ 4.2      $ 11.6   

Accumulated unrealized gains on available-for-sale investments

     1.5        3.4   

Accumulated unrealized gains (losses) on derivatives qualifying as cash flow hedges

     1.9        (2.2

Accumulated defined benefit obligation adjustments

     (3.0     0.0   
  

 

 

   

 

 

 

Total accumulated other comprehensive income

   $ 4.6      $ 12.8   
  

 

 

   

 

 

 
Components Of Comprehensive Income, Net Of Related Immaterial Tax Effects
     Three Months Ended     Nine Months Ended  
     January 27,
2012
    January 28,
2011
    January 27,
2012
    January 28,
2011
 

Net income

   $ 119.6      $ 186.4      $ 424.7      $ 512.5   

Change in currency translation adjustments

     (4.3     0.4        (7.4     4.7   

Change in unrealized gains (losses) on available-for-sale investments

     3.5        (6.4     (1.9     (0.1

Change in unrealized gains (losses) on derivatives qualifying as cash flow hedges

     1.4        2.2        4.1        (0.2

Change in defined benefit obligation adjustments

     (3.0     0.0        (3.0     0.0   
  

 

 

   

 

 

   

 

 

   

 

 

 

Comprehensive income

   $ 117.2      $ 182.6      $ 416.5      $ 516.9