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Discontinued Operations, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2020
Intangible assets |  |
Intangible Assets, Net | $ 99,636 | $ 81,995
Backlog and customer relationships |  |
Intangible assets |  |
Gross Amount | 661,400 | 662,100
Accumulated Amortization | (561,800) | (580,100)
Intangible Assets, Net | $ 99,600 | $ 82,000
Minimum | Backlog and customer relationships |  |
Intangible assets |  |
Amortization Period | 1 year |
Maximum | Backlog and customer relationships |  |
Intangible assets |  |
Amortization Period | 11 years |

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