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Discontinued Operations, Goodwill and Intangible Assets - Schedule of Income Statement Information of Discontinued Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Loss on disposal activities | $ 0 | $ (90,412) | $ (43,222)
Net loss from discontinued operations | (75,364) | (104,997) | (57,207)
Held for Sale |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Revenue | 97,600 | 178,200 | 212,800
Cost of revenue | 101,400 | 181,100 | 223,200
Gross loss | (3,800) | (2,900) | (10,400)
Equity in losses of joint ventures | (10,100) | (3,400) | (2,900)
Loss on disposal activities | (83,800) | (97,100) | (50,600)
Transaction costs | 0 | (200) | (200)
Loss from operations | (97,700) | (103,600) | (64,100)
Other expense | (300) | (1,500) | (1,000)
Loss before taxes | (98,000) | (105,100) | (65,100)
Income tax benefit | (22,600) | (100) | (7,900)
Net loss from discontinued operations | $ (75,400) | $ (105,000) | $ (57,200)

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