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Other Balance Sheet Items (Tables)

6 Months Ended

Mar. 31, 2023

Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract]

Schedule of Cash and Cash Equivalents

Table 10.1: Details of Cash and Cash Equivalents and Restricted Cash
			March 31, 2023						September 30, 2022
			(in thousands)
Cash and cash equivalents			$	56,344					$	40,658
Restricted cash (1)			62,376						96,137
Cash, cash equivalents, and restricted cash			$	118,720					$	136,795

(1)Restricted cash is recorded within "Prepaid expenses and other current assets" on the Consolidated Balance Sheets. At September 30, 2022, this balance included $60.7 million of funds received from a customer which had previously been sold under our Receivables Purchase Agreement; this is offset by a corresponding liability in "Other current liabilities". No similar arrangements existed at March 31, 2023. The remaining balance includes funds held in trust on behalf of certain clients, offset with a corresponding liability in "Other current liabilities", and certain collateral obligations on contracts.

Schedule of Restrictions on Cash and Cash Equivalents

Table 10.1: Details of Cash and Cash Equivalents and Restricted Cash
			March 31, 2023						September 30, 2022
			(in thousands)
Cash and cash equivalents			$	56,344					$	40,658
Restricted cash (1)			62,376						96,137
Cash, cash equivalents, and restricted cash			$	118,720					$	136,795

(1)Restricted cash is recorded within "Prepaid expenses and other current assets" on the Consolidated Balance Sheets. At September 30, 2022, this balance included $60.7 million of funds received from a customer which had previously been sold under our Receivables Purchase Agreement; this is offset by a corresponding liability in "Other current liabilities". No similar arrangements existed at March 31, 2023. The remaining balance includes funds held in trust on behalf of certain clients, offset with a corresponding liability in "Other current liabilities", and certain collateral obligations on contracts.

Schedule of Supplementary Cash Flow Information

Table 10.2: Supplemental Disclosures of Cash Flow Information
			For the Six Months Ended
			March 31, 2023						March 31, 2022
			(in thousands)
Interest payments			$	19,262					$	17,755
Income tax payments			$	31,926					$	50,531

Schedule of Details of Accounts Receivable

Table 10.3: Details of Accounts Receivable, Net
			March 31, 2023						September 30, 2022
			(in thousands)
Billed and billable receivables			$	614,907					$	723,979
Unbilled receivables			134,695						91,404
Allowance for credit losses			(7,215)						(8,273)
Accounts receivable, net			$	742,387					$	807,110

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- Definition

Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.

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Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage.

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