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Property and Equipment, Net (Tables)
12 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Components of Property and Equipment, Net

The components of property and equipment, net are:

 

     As of September 30,  
     2018      2017  

Computers, related equipment and software

   $ 1,027,825      $ 978,040  

Building and land

     97,782        —    

Leasehold improvements

     222,812        213,166  

Furniture, fixtures and other

     43,518        56,324  
  

 

 

    

 

 

 

Property and equipment, gross

     1,391,937        1,247,530  
  

 

 

    

 

 

 

Less accumulated depreciation

     (895,352      (891,845
  

 

 

    

 

 

 

Property and equipment, net

   $ 496,585      $ 355,685