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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
	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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