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Revenue (Tables)
 12 Months Ended
Sep. 30, 2023
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,
2023

 

 

September 30,
2022

 

Accounts receivable — billed (net of allowances for doubtful
   accounts of $19,801 and $16,627 as of September 30, 2023
   and 2022, respectively)

 

$

732,979

 

 

$

789,611

 

Accounts receivable — unbilled (current)

 

$

211,498

 

 

$

157,166

 

Accounts receivable — unbilled (non-current)

 

$

45,176

 

 

$

27,417

 

Total Accounts receivable — unbilled

 

$

256,674

 

 

$

184,583

 

Deferred revenue (current)

 

$

(170,634

)

 

$

(253,686

)

Deferred revenue (non-current)

 

$

(805

)

 

$

(69,907

)

Total Deferred revenue

 

$

(171,439

)

 

$

(323,593

)