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Revenue Recognition - Effect of Changes in Contract Estimates (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |
Benefit to/(reduction of) revenue recognized due to changes in contract estimates | $ 4,904,728 | $ 4,631,018 | $ 4,254,485
Benefit to/(reduction of) diluted earnings per share recognized due to changes in contract estimates (in dollars per share) | $ 2.63 | $ 3.29 | $ 4.67
Change in contract estimates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Benefit to/(reduction of) revenue recognized due to changes in contract estimates | $ (13,346) | $ (2,500) |
Benefit to/(reduction of) diluted earnings per share recognized due to changes in contract estimates (in dollars per share) | $ (0.16) | $ (0.03) |

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