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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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