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Property and Equipment, Net
9 Months Ended
Apr. 30, 2011
Property and Equipment, Net [Abstract]  
Property and Equipment, Net
7. Property and Equipment, Net
Property and equipment, net consists of the following:
                         
    Estimated     April 30,     July 31,  
    Useful Lives     2011     2010  
    (in thousands, except estimated useful lives)  
 
                       
Computer equipment
  2 years   $ 11,172     $ 7,993  
Computer software
    2 to 5 years       5,450       4,558  
Machinery and equipment
  2 years     13,241       10,441  
Furniture and fixtures
  5 years     2,926       2,397  
Leasehold improvements
    2 to 6 years       2,417       2,174  
 
                   
Total property and equipment, gross
            35,206       27,563  
Less: Accumulated depreciation and amortization
            (22,676 )     (17,644 )
 
                   
Total property and equipment, net
          $ 12,530     $ 9,919