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Discontinued Operations, Goodwill and Intangible Assets - Schedule of Balance Sheet Information of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
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Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] |  |
Non-current assets held for sale | $ 16,892 | $ 0
Held for Sale |  |
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] |  |
Cash and cash equivalents | 0 | 4,000
Receivables and contract assets | 0 | 73,200
Current assets held for sale | 0 | 77,200
Investment in unconsolidated joint venture | 16,900 | 0
Property and equipment, net | 0 | 16,700
Other | 0 | 1,200
Write-down of assets to fair value less cost to sell | 0 | (17,900)
Non-current assets held for sale | 16,900 | 0
Accounts payable and accrued expenses | 0 | 35,600
Current liabilities held for sale | $ 0 | $ 35,600

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