Discontinued Operations, Goodwill, and Intangible Assets - Intangible assets (Details) - USD ($) $ in Thousands |
Mar. 31, 2024 |
Sep. 30, 2023 |
|---|---|---|
| Discontinued Operations, Goodwill and Intangible Assets | ||
| Intangible Assets, Net | $ 16,111 | $ 17,769 |
| Backlog and Customer relationships | ||
| Discontinued Operations, Goodwill and Intangible Assets | ||
| Gross Amount | 671,500 | 663,800 |
| Accumulated Amortization | (655,400) | (646,000) |
| Intangible Assets, Net | $ 16,100 | $ 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 |