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Discontinued Operations, Goodwill, and Intangible Assets - Intangible assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023
Discontinued Operations, Goodwill and Intangible Assets
Intangible Assets, Net	$ 11,515	$ 17,769
Backlog and Customer relationships
Discontinued Operations, Goodwill and Intangible Assets
Gross Amount	671,600	663,800
Accumulated Amortization	(660,100)	(646,000)
Intangible Assets, Net	$ 11,500	$ 17,800
Backlog and Customer relationships | Minimum
Discontinued Operations, Goodwill and Intangible Assets
Amortization Period	1 year
Backlog and Customer relationships | Maximum
Discontinued Operations, Goodwill and Intangible Assets
Amortization Period	11 years

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