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Business Acquisitions, Goodwill and Intangible Assets - Disposal Group (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Business acquisitions, goodwill and intangible assets |  |  |  |  |  |  |  |  |
Loss (gain) on disposal activities | $ 3,000 | $ 7,400 |  | $ 800 | $ 2,100 |  | $ 10,381 | $ 2,949 | $ (572)
Impairment of long-lived assets | $ 615,400 |  | $ 168,200 |  |  | $ 168,200 | 615,400 | 168,178 |
Construction Services |  |  |  |  |  |  |  |  |
Business acquisitions, goodwill and intangible assets |  |  |  |  |  |  |  |  |
Loss (gain) on disposal activities |  |  |  |  |  |  | 7,400 | 2,900 |
Impairment of long-lived assets |  |  |  |  |  |  | $ 590,500 | $ 168,200 |
Construction Services | Disposal Group as held for sale |  |  |  |  |  |  |  |  |
Business acquisitions, goodwill and intangible assets |  |  |  |  |  |  |  |  |
Loss (gain) on disposal activities |  | $ 7,400 |  |  | $ 2,100 |  |  |  |

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