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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2018
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ 599,548 |  |  |  | $ 948,148 |  |  |  | $ 599,548 | $ 948,148 |  |
Revenue | $ 5,115,600 | $ 4,980,200 | $ 5,040,000 | $ 5,037,500 | $ 5,305,800 | $ 5,148,000 | $ 4,790,900 | $ 4,910,800 | 20,173,329 | 20,155,512 | $ 18,203,402 |
Construction Services |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,778,800 | 8,238,900 | 7,295,600 |
ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | $ (7,000)
Subcontractor and other direct costs |  |  |  |  |  |  |  |  | 10,300,000 | $ 10,700,000 | $ 9,200,000 |
ASU 2014-09 | Construction Services |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 4,800 |  |  |

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