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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, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Summary of financial information of the Disposal Group |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposal activities |  |  |  |  |  |  |  |  | $ (52,532) | $ 161,900 |
Impairment of long-lived assets, including goodwill |  |  |  |  |  |  |  |  | (105,194) | (336,472) | $ (615,400)
Net loss from discontinued operations | $ 2,300 | $ (15,400) | $ (47,900) | $ (55,800) | $ (228,000) | $ (100) | $ (130,700) | $ 18,200 | (116,813) | (340,591) | $ (419,662)
Held for sale |  |  |  |  |  |  |  |  |  |  |
Summary of financial information of the Disposal Group |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 771,500 | 3,150,800 |
Cost of revenue |  |  |  |  |  |  |  |  | 760,500 | 3,179,200 |
Gross (loss) profit |  |  |  |  |  |  |  |  | 11,000 | (28,400) |
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 4,000 | (25,500) |
(Loss) gain on disposal activities |  |  |  |  |  |  |  |  | (52,500) | 161,900 |
Transaction costs |  |  |  |  |  |  |  |  | (15,300) | (43,200) |
Impairment of long-lived assets, including goodwill |  |  |  |  |  |  |  |  | (105,200) | (336,500) |
Loss from operations |  |  |  |  |  |  |  |  | (158,000) | (271,700) |
Other income |  |  |  |  |  |  |  |  |  | 1,800 |
Interest expense |  |  |  |  |  |  |  |  | (500) | (40,500) |
Loss before taxes |  |  |  |  |  |  |  |  | (158,500) | (310,400) |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (41,700) | 30,200 |
Net loss from discontinued operations |  |  |  |  |  |  |  |  | $ (116,800) | $ (340,600) |

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