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Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Oct. 01, 2018
Revenue Recognition |  |  |  |
Retained earnings | $ 174,248 | $ 599,548 |  |
ASU 2014-09 |  |  |  |
Revenue Recognition |  |  |  |
Retained earnings |  |  |  | $ 7,000
Subcontractor and other direct costs | $ 7,100,000 | $ 7,400,000 | $ 7,700,000 |

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