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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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