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Accounts Receivable, Net
3 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Accounts Receivable, Net ACCOUNTS RECEIVABLE, NET
Table 12: Details of Accounts Receivable, Net
December 31, 2021September 30, 2021
(in thousands)
Billed and billable receivables$717,804 $718,728 
Unbilled receivables139,348 124,135 
Allowance for credit losses(7,742)(8,044)
Accounts receivable, net$849,410 $834,819