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Fair Value Measurements - Additional Information (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Fair Value Disclosures [Abstract] |  |  |
Fair value, assets, level 1 to level 2 transfers | $ 0 | $ 0 | $ 0
Fair value, assets, level 2 to level 1 transfers | 0 | 0 | 0
Fair value, assets, level 2 to level 3 transfers | 0 | 0 | 0
Fair value, assets, level 3 to level 2 transfers | 0 | 0 | 0
Fair value, assets, level 1 to level 3 transfers | 0 | 0 | 0
Fair value, assets, level 3 to level 1 transfers | 0 | 0 | 0
Fair value, liabilities, level 1 to level 2 transfers | 0 | 0 | 0
Fair value, liabilities, level 2 to level 1 transfers | 0 | 0 | 0
Fair value, liabilities, level 2 to level 3 transfers | 0 | 0 | 0
Fair value, liabilities, level 3 to level 2 transfers | 0 | 0 | 0
Fair value, liabilities, level 1 to level 3 transfers | 0 | 0 | 0
Fair value, liabilities, level 3 to level 1 transfers | 0 | 0 | 0
Reclassified out of accumulated other comprehensive income | 0 | $ 0 |
Contingent consideration liabilities | $ 82,800,000 |  | $ 80,700,000

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