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Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ (7,742)	$ (8,044)
Accounts receivable, net	849,410	834,819
Billed and billable receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Gross	717,804	718,728
Unbilled receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Gross	$ 139,348	$ 124,135

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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