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Revenue Recognition - Effect of Changes in Contract Estimates (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Benefit to/(reduction of) revenue recognized due to changes in contract estimates | $ 1,188,677 | $ 1,125,785 | $ 3,644,775 | $ 3,453,987
Benefit to/(reduction of) diluted earnings per share recognized due to changes in contract estimates (in dollars per share) | $ 0.50 | $ 0.51 | $ 1.67 | $ 2.17
Change in contract estimates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Benefit to/(reduction of) revenue recognized due to changes in contract estimates | $ (2,134) | $ (959) | $ (8,272) | $ (5,174)
Benefit to/(reduction of) diluted earnings per share recognized due to changes in contract estimates (in dollars per share) | $ (0.03) | $ (0.01) | $ (0.09) | $ (0.06)

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