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Discontinued Operations, Goodwill, and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019
Identifiable intangible assets with finite useful lives |  |
Intangible Assets, Net | $ 76,917 | $ 99,636
Backlog and customer relationships |  |
Identifiable intangible assets with finite useful lives |  |
Gross Amount | 662,800 | 661,400
Accumulated Amortization | (585,900) | (561,800)
Intangible Assets, Net | $ 76,900 | $ 99,600
Backlog and customer relationships | Minimum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 1 year |
Backlog and customer relationships | Maximum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 11 years |

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