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Accounts Receivable, Net
6 Months Ended
Mar. 31, 2022
Receivables [Abstract]  
Accounts Receivable, Net ACCOUNTS RECEIVABLE, NET
Table 14: Details of Accounts Receivable, Net
March 31, 2022September 30, 2021
(in thousands)
Billed and billable receivables$742,713 $718,728 
Unbilled receivables148,122 124,135 
Allowance for credit losses(5,150)(8,044)
Accounts receivable, net$885,685 $834,819