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Net Income (Loss) Per Share
 6 Months Ended
Jul. 31, 2011
Net Income (Loss) Per Share
(12) Net Income (Loss) Per Share—We compute basic net income (loss) per share using the weighted average number of common shares outstanding during the period. We compute diluted net income (loss) per share using the weighted average number of common shares and potentially dilutive common shares outstanding during the period. Potentially dilutive common shares consist of common shares issuable upon exercise of stock options, restricted stock units, purchase rights from ESPPs, and warrants using the treasury stock method and common shares issuable upon conversion of the convertible subordinated debentures, if dilutive.

 

The following provides the computation of basic and diluted net loss per share:

 

     Three months ended July 31,     Six months ended July 31,  
         2011              2010             2011              2010      

Net income (loss)

    $ 4,334       $ (14,247 )    $ 1,981       $ (37,272 ) 
  

 

 

     

 

 

    

 

 

     

 

 

  

Weighted average common shares used to calculate basic and diluted net income (loss) per share

      110,027         107,629        110,888         105,717   

Employee stock options, restricted stock units and employee stock purchase plan

      2,817         —          3,004         —     
  

 

 

     

 

 

    

 

 

     

 

 

  

Weighted average common and potential common shares used to calculate diluted net income (loss) per share

      112,844         107,629        113,892         105,717   
  

 

 

     

 

 

    

 

 

     

 

 

  

Basic net income (loss) per share

    $ 0.04       $ (0.13 )    $ 0.02       $ (0.35 ) 
  

 

 

     

 

 

    

 

 

     

 

 

  

Diluted net income (loss) per share

    $ 0.04       $ (0.13 )    $ 0.02       $ (0.35 ) 
  

 

 

     

 

 

    

 

 

     

 

 

  

We excluded from the computation of diluted net income (loss) per share stock options, restricted stock units, and ESPP purchase rights to purchase 4,050 shares of common stock for the three months ended July 31, 2011 and 3,992 shares of common stock for the six months ended July 31, 2011 compared to 14,765 for the three and six months ended July 31, 2010. The stock options, restricted stock units, and ESPP purchase rights were anti-dilutive either because we incurred a net loss for the period or the stock options or ESPP purchase rights were determined to be anti-dilutive as a result of applying the treasury stock method.

The effect of the conversion of the Floating Rate Convertible Subordinated Debentures due 2023 (retired during fiscal 2011), the 6.25% Debentures (retired during the six months ended July 31, 2011), and the 4.00% Debentures was anti-dilutive and therefore excluded from the computation of diluted net income (loss) per share. We assume that the 6.25% Debentures and the 4.00% Debentures will be settled in common stock for purposes of calculating the dilutive effect of the 6.25% Debentures and the 4.00% Debentures.

The conversion features of the 4.00% Debentures, which allow for settlement in cash or a combination of cash and common stock, are further described in Note 8. “Notes Payable.”