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Other Balance Sheet Items (Tables) | 9 Months Ended
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Jun. 30, 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
| June 30, 2023 |  | September 30, 2022
| (in thousands)
Cash and cash equivalents | $ | 35,007 |  |  | $ | 40,658 |
Restricted cash | 56,686 |  |  | 96,137 |
Cash, cash equivalents, and restricted cash | $ | 91,693 |  |  | $ | 136,795 |
Schedule of Restrictions on Cash and Cash Equivalents |
Table 10.1: Details of Cash and Cash Equivalents and Restricted Cash
| June 30, 2023 |  | September 30, 2022
| (in thousands)
Cash and cash equivalents | $ | 35,007 |  |  | $ | 40,658 |
Restricted cash | 56,686 |  |  | 96,137 |
Cash, cash equivalents, and restricted cash | $ | 91,693 |  |  | $ | 136,795 |
Schedule of Supplementary Cash Flow Information |
Table 10.2: Supplemental Disclosures of Cash Flow Information
| For the Nine Months Ended
| June 30, 2023 |  | June 30, 2022
| (in thousands)
Interest payments | $ | 59,580 |  |  | $ | 28,251 |
Income tax payments | $ | 60,460 |  |  | $ | 64,057 |
Schedule of Details of Accounts Receivable |
Table 10.3: Details of Accounts Receivable, Net
| June 30, 2023 |  | September 30, 2022
| (in thousands)
Billed and billable receivables | $ | 683,180 |  |  | $ | 723,979 |
Unbilled receivables | 120,097 |  |  | 91,404 |
Allowance for credit losses | (4,768) |  |  | (8,273) |
Accounts receivable, net | $ | 798,509 |  |  | $ | 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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