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Discontinued Operations, Goodwill, and Intangible Assets - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Discontinued Operations, Goodwill, and Intangible Assets
Revenue	$ 330,700	$ 1,502,800
Cost of revenue	322,900	1,473,500
Gross profit	7,800	29,300
Equity in earnings of joint ventures	7,700	4,900
Loss on disposal activities	(11,334)
Transaction costs	(10,900)
Impairment of long-lived assets	(95,814)
(Loss) income from operations	(102,500)	34,200
Other income		1,200
Interest expense	(200)	(12,800)
(Loss) income before taxes	(102,700)	22,600
Income tax (benefit) expense	(46,900)	4,400
Net (loss) income from discontinuing operations	$ (55,752)	$ 18,180

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