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Revenue
 12 Months Ended
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]  
Revenue
Note 4 — Revenue
Contract Balances
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
 )
Revenue recognized during the year ended September 30, 2020, which was included in deferred revenue (current) as of September 30, 2019 was $104,648. Revenue recognized during the year ended September 30, 2019, which was included in deferred revenue (current) as of October 1, 2018 was $93,508.
Remaining Performance Obligations from Contracts with Customer
As of September 30, 2020, the aggregate amount of the transaction price allocated to remaining performance obligations that are unsatisfied or partially unsatisfied was approximately $5.1 billion. Remaining performance obligations typically include the remaining
non-cancelable,
committed and fixed portion of contracts for their entire duration and therefore it is not comparable to what the Company considers to be next 12 months backlog. Given the profile of contract terms, the majority of this amount is expected to be recognized as revenue over the next three years.
Disaggregation of Revenue
The Company considers information that is regularly reviewed by its chief operating decision makers in evaluating financial performance to disaggregate revenue, see
Note 22 — Segment 
Information and Sales to Significant Customers.