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Accounts Receivable, Net (Tables)
9 Months Ended
Jun. 30, 2022
Receivables [Abstract]  
Details of Accounts Receivable
Table 11: Details of Accounts Receivable, Net
June 30, 2022September 30, 2021
(in thousands)
Billed and billable receivables$762,456 $718,728 
Unbilled receivables112,588 124,135 
Allowance for credit losses(7,034)(8,044)
Accounts receivable, net$868,010 $834,819