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Other Balance Sheet Items (Tables) | 3 Months Ended
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Dec. 31, 2023
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] |
Schedule of Cash and Cash Equivalents |
Table 9.1: Details of Cash and Cash Equivalents and Restricted Cash
| December 31, 2023 |  | September 30, 2023
| (in thousands)
Cash and cash equivalents | $ | 104,186 |  |  | $ | 65,405 |
Restricted cash | 49,309 |  |  | 56,686 |
Cash, cash equivalents, and restricted cash | $ | 153,495 |  |  | $ | 122,091 |
Restricted cash is recorded within "Prepaid expenses and other current assets" on the Consolidated Balance Sheets.
Restrictions on Cash and Cash Equivalents |
Table 9.1: Details of Cash and Cash Equivalents and Restricted Cash
| December 31, 2023 |  | September 30, 2023
| (in thousands)
Cash and cash equivalents | $ | 104,186 |  |  | $ | 65,405 |
Restricted cash | 49,309 |  |  | 56,686 |
Cash, cash equivalents, and restricted cash | $ | 153,495 |  |  | $ | 122,091 |
Restricted cash is recorded within "Prepaid expenses and other current assets" on the Consolidated Balance Sheets.
Supplementary Cash Flow Information |
Table 9.2: Supplemental Disclosures of Cash Flow Information
| For the Three Months Ended
| December 31, 2023 |  | December 31, 2022
| (in thousands)
Interest payments | $ | 20,522 |  |  | $ | 19,748 |
Income tax (refunds)/payments, net | $ | (588) |  |  | $ | 4,982 |
Details of Accounts Receivable |
Table 9.3: Details of Accounts Receivable, Net
| December 31, 2023 |  | September 30, 2023
| (in thousands)
Billed and billable receivables | $ | 708,145 |  |  | $ | 692,707 |
Unbilled receivables | 160,250 |  |  | 137,885 |
Allowance for credit losses | (7,986) |  |  | (3,719) |
Accounts receivable, net | $ | 860,409 |  |  | $ | 826,873 |

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