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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Oct. 01, 2018	Sep. 30, 2018
Revenue Recognition
Retained earnings	$ 957,230			$ 948,148
Revenue	5,037,495	$ 4,910,832
Construction Services
Revenue Recognition
Revenue	2,014,500	$ 2,125,500
Accounting Standards Update 2014-09
Revenue Recognition
Retained earnings			$ 7,000
Accounting Standards Update 2014-09 | Construction Services
Revenue Recognition
Revenue	$ 1,500

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