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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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