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Other Balance Sheet Items | 6 Months Ended
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Mar. 31, 2024
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] |
Other Balance Sheet Items | OTHER BALANCE SHEET ITEMS Cash, Cash Equivalents, and Restricted Cash
Table 10.1: Details of Cash and Cash Equivalents and Restricted Cash
| March 31, 2024 |  | September 30, 2023
| (in thousands)
Cash and cash equivalents | $ | 77,370 |  |  | $ | 65,405 |
Restricted cash | 40,970 |  |  | 56,686 |
Cash, cash equivalents, and restricted cash | $ | 118,340 |  |  | $ | 122,091 |
Restricted cash is recorded within "Prepaid expenses and other current assets" on the Consolidated Balance Sheets.
Table 10.2: Supplemental Disclosures of Cash Flow Information
| For the Six Months Ended
| March 31, 2024 |  | March 31, 2023
| (in thousands)
Interest payments | $ | 39,946 |  |  | $ | 19,262 |
Income tax payments | $ | 43,794 |  |  | $ | 31,926 |
Accounts Receivable, Net
Table 10.3: Details of Accounts Receivable, Net
| March 31, 2024 |  | September 30, 2023
| (in thousands)
Billed and billable receivables | $ | 776,877 |  |  | $ | 692,707 |
Unbilled receivables | 150,956 |  |  | 137,885 |
Allowance for credit losses | (11,829) |  |  | (3,719) |
Accounts receivable, net | $ | 916,004 |  |  | $ | 826,873 |
On September 21, 2022, we entered into a Receivables Purchase Agreement with Wells Fargo Bank N.A., under which we may sell certain U.S.-originated accounts receivable balances up to a maximum amount of $200.0 million at any given time. In return for these sales, we receive a cash payment equal to the face value of the receivables less a financing charge. We account for these transfers as sales. We have no retained interest in the transferred receivables other than administrative responsibilities, and Wells Fargo has no recourse for any credit risk. We estimate that the implicit servicing fees for an arrangement of this size and type would be immaterial. For the six months ended March 31, 2024, the gross fair value of accounts receivables transferred to Wells Fargo and derecognized from our balance sheet was $133.0 million. In exchange for these sales, we received $132.2 million of cash. The balance, representing a loss on sale from these transfers, is included within our selling, general, and administrative expenses. We have recorded these transactions within our operating cash flows.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//210/tableOfContent + Details
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