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Discontinued Operations, Goodwill, and Intangible Assets - Income Statement Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Discontinued Operations, Goodwill and Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal activities |  |  |  |  |  |  |  |  | $ 161,900 |  |
Impairment of long-lived assets, including goodwill |  |  |  |  |  |  |  |  | (336,472) | $ (615,400) | $ (168,178)
Net loss from discontinued operations | $ (228,000) | $ (100) | $ (130,700) | $ 18,200 | $ (526,400) | $ 43,300 | $ 35,200 | $ 28,200 | (340,591) | (419,662) | $ (18,575)
Held for sale |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Goodwill and Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,150,800 | 6,530,900 |
Cost of revenue |  |  |  |  |  |  |  |  | 3,179,200 | 6,329,100 |
Gross (loss) profit |  |  |  |  |  |  |  |  | (28,400) | 201,800 |
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | (25,500) | 31,700 |
Gain (loss) on disposal activities |  |  |  |  |  |  |  |  | 161,900 | (14,000) |
Transaction costs |  |  |  |  |  |  |  |  | (43,200) |  |
Impairment of long-lived assets, including goodwill |  |  |  |  |  |  |  |  | (336,500) | (590,500) |
Loss from operations |  |  |  |  |  |  |  |  | (271,700) | (371,000) |
Other income |  |  |  |  |  |  |  |  | 1,800 | 2,500 |
Interest expense |  |  |  |  |  |  |  |  | (40,500) | (64,800) |
Loss before taxes |  |  |  |  |  |  |  |  | (310,400) | (433,300) |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 30,200 | (13,600) |
Net loss from discontinued operations |  |  |  |  |  |  |  |  | $ (340,600) | $ (419,700) |

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