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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Oct. 01, 2018	Sep. 30, 2018
Revenue Recognition
Retained earnings	$ 1,005,086		$ 1,005,086			$ 948,148
Revenue	5,040,022	$ 4,790,910	10,077,517	$ 9,701,742
Construction Services
Revenue Recognition
Revenue	$ 1,917,800	$ 1,888,300	3,932,300	$ 4,013,800
Accounting Standards Update 2014-09
Revenue Recognition
Retained earnings					$ 7,000
Accounting Standards Update 2014-09 | Construction Services
Revenue Recognition
Revenue			$ 3,300

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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