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Revenue (Tables)
 12 Months Ended
Sep. 30, 2022
Revenue from Contract with Customer [Abstract]  
Summary of Accounts Receivable and Deferred Revenue
The following table provides information about Accounts receivable, both billed and unbilled and deferred revenue:
 
 
  
As of
 
 
  
September 30,

2022
 
  
September 30,

2021
 
Accounts
receivable — billed
(net of allowances for doubtful accounts
of
 
$16,627 and $20,065 as of September 30, 2022 and 2021,
respectively)
  
$
 789,611
 
  
$
 704,541  
Accounts receivable — unbilled (current)
  
$
 157,166
 
  
$
 162,278  
Accounts receivable — unbilled
(non-current)
  
$
 27,417
 
  
$
 38,252  
 
 
 
 
 
 
 
 
 
Total Accounts receivable — unbilled
  
$
 184,583
 
  
$
 200,530  
 
 
 
 
 
 
 
 
 
Deferred revenue (current)
  
$
  (253,686
)
  
$
 (237,374
)
Deferred revenue
(non-current)
  
$
 (69,907
)
  
$
 (108,675
)
 
 
 
 
 
 
 
 
 
Total Deferred revenue
  
$
 (323,593
)
  
$
 (346,049
)