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Discontinued Operations, Goodwill and Intangible Assets - Income statement information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Discontinued Operations, Goodwill and Intangible Assets
Net income from discontinuing operations	$ 18,180	$ 28,165
Disposal Group as held for sale | Management Services
Discontinued Operations, Goodwill and Intangible Assets
Revenue	1,502,800	1,681,200
Cost of revenue	1,473,500	1,634,000
Gross profit	29,300	47,200
Equity in earnings of joint ventures	4,900	5,900
Income from operations	34,200	53,100
Other income	1,200	600
Interest expense	(12,800)	(16,700)
Income before taxes	22,600	37,000
Income tax expense	4,400	8,800
Net income from discontinuing operations	$ 18,200	$ 28,200

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