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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Jul. 31, 2011
Fair Value Measurements (Tables) [Abstract]  
Schedule of financial assets and liabilities that are measured at fair value on a recurring basis
Schedule of financial assets and liabilities that are measured at fair value on a recurring basis
 
      Fair Value Measurements 
  As of         
      Jul. 31, 2011     Level 1     Level 2     Level 3
Financial assets carried at fair value            
       Money market funds $     4,575 $     4,575 $      $     
       Available-for-sale securities:            
              Equity securities  12,064  12,064     
              Debt securities:            
                     Corporate  38,505    38,505  
                     U.S. Treasury  10,210    10,210  
                     Other U.S. government  29,089    29,089  
                     Municipal government  1,002    1,002  
                     CMO/mortgage-backed  186    186  
       Derivative financial instruments:            
              Foreign exchange forward contracts  1,456    1,456  
             
Financial liabilities carried at fair value            
       Derivative financial instruments:            
              Foreign exchange forward contracts  478    478  
 
     The following table presents, for each of these hierarchy levels, the Company’s financial assets and liabilities that are measured at fair value as of July 31, 2010:
 
      Fair Value Measurements 
  As of         
      Jul. 31, 2010     Level 1     Level 2     Level 3
Financial assets carried at fair value            
       Money market funds $     5,034 $     5,034 $      $     
       Available-for-sale securities:            
              Equity securities  5,224  5,224    
              Debt securities:            
                   Corporate  27,676    27,676  
                   U.S. Treasury  19,209    19,209  
                   Other U.S. government  20,163    20,163  
                   Municipal government  1,001    1,001  
                   CMO/mortgage-backed  256    256  
       Derivative financial instruments:            
              Foreign exchange forward contracts  2,166    2,166  
             
Financial liabilities carried at fair value            
       Derivative financial instruments:            
              Foreign exchange forward contracts  555    555