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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
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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