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Revenue (Tables)
 12 Months Ended
Sep. 30, 2019
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,
2018
 
  
October 1,
2018 (as adjusted)
 
  
September 30,
2019
 
Accounts receivable — billed (net of allowances for doubtful accounts of $21,211 as of September 30 and October 1, 2018 and $36,121 as of September 30, 2019)
  $
707,505
    $
707,505
    $
760,797
 
Accounts receivable — unbilled (current)
  $
263,997
    $
274,036
    $
227,061
 
Accounts receivable — unbilled
(non-current)
  $
15,686
    $
13,185
    $
16,987
 
                         
Total Accounts receivable — unbilled
  $
279,683
    $
287,221
    $
244,048
 
Deferred revenue (current)
  $
(132,414
 )   $
(146,462
 )   $
(118,182
 )
Deferred revenue
(non-current)
  $
(27,977
 )   $
(27,977
 )   $
(23,785
 )
                         
Total Deferred revenue
  $
(160,391
 )   $
(174,439
 )   $
(141,967
 )