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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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