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Revenue (Tables)
 12 Months Ended
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]  
Summary of Accounts Receivable and Deferred Revenue
The following table provides information a
b
out Accounts receivable, both billed and unbilled and deferred revenue:
    
As of
  
    
September 30,

2020
    
September 30,

2019
  
Accounts receivable — billed
 (net of allowances for doubtful accounts of $23,419
and $36,121
 
as
of September 30, 2020 and 2019, respectively)
   $
685,485
     $
760,797
  
Accounts receivable — unbilled (current)
   $
175,548
     $
227,061
  
Accounts receivable — unbilled (non-current)
   $
42,089
     $
16,987
  
                 
Total Accounts receivable — unbilled
   $
217,637
     $
244,048
  
Deferred revenue (current)
  $
(126,841
 )   $
(118,182
 )
Deferred revenue
(non-current)
  $
(16,529
 )   $
(23,785
 )
                 
Total Deferred revenue
  $
(143,370
 )   $
(141,967
 )