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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Oct. 01, 2018	Sep. 30, 2018
Revenue Recognition
Retained earnings	$ 1,088,824		$ 1,088,824			$ 948,148
Revenue	$ 4,980,204	$ 5,147,920	15,057,721	$ 14,849,662
Accounting Standards Update 2014-09
Revenue Recognition
Retained earnings					$ 7,000
Accounting Standards Update 2014-09 | Construction Services
Revenue Recognition
Revenue			$ 4,000

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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