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Revenue Recognition - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |
Deferred revenue, revenue recognized | $ 37,700 | $ 51,100 |
Revenue | $ 1,327,041 | $ 1,249,246 |
Diluted (in dollars per share) | $ 1.04 | $ 0.65 |
Change in estimate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ (4,600) |  |
Diluted (in dollars per share) | $ (0.07) |  |
Unbilled receivables |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unbilled contracts receivable | $ 21,600 |  | $ 20,700

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