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Business Combinations and Divestitures - Schedule of Asset Acquired and Liabilities Assumed, Attain (Details) - USD ($) $ in Thousands | Mar. 01, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | --- | --- | ---
Liabilities assumed: |  |  |  |
Goodwill |  | $ 1,779,215 | $ 1,779,415 | $ 1,774,406
Attain |  |  |  |
Allocation of Assets and Liabilities |  |  |  |
Cash consideration paid, net of cash acquired | $ 419,097 |  |  |
Assets acquired: |  |  |  |
Accounts receivable - billed, billable and unbilled | 39,375 |  |  |
Prepaid expenses and other current assets | 926 |  |  |
Operating lease right-of-use assets | 24,960 |  |  |
Intangible assets | 105,000 |  |  |
Other assets | 74 |  |  |
Total identifiable assets acquired | 170,335 |  |  |
Liabilities assumed: |  |  |  |
Accounts payable and accrued compensation | 28,863 |  |  |
Operating lease liabilities | 26,401 |  |  |
Total identifiable liabilities assumed | 55,264 |  |  |
Net identifiable assets acquired | 115,071 |  |  |
Goodwill | 304,026 |  |  |
Net assets acquired | $ 419,097 |  |  |

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