Discontinued Operations, Goodwill and Intangible Assets - Schedule of Gross Amount and Accumulated Amortization of Acquired Identifiable Intangible Assets with Finite Useful Lives (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Finite-Lived Intangible Assets [Line Items]
Total	$ 5,926	$ 6,932
Backlog and Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	7,400	671,700
Accumulated Amortization	(1,500)	(664,800)
Total	$ 5,900	$ 6,900
Backlog and Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period (in years)	1 year
Backlog and Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period (in years)	11 years