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Discontinued Operations, Goodwill, and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020
Identifiable intangible assets with finite useful lives |  |
Intangible Assets, Net | $ 72,003 | $ 76,917
Backlog and customer relationships |  |
Identifiable intangible assets with finite useful lives |  |
Gross Amount | 663,300 | 662,800
Accumulated Amortization | (591,300) | (585,900)
Intangible Assets, Net | $ 72,000 | $ 76,900
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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