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Fair Value Measurements - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
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 | 0 | $ 0 |
Assets held for sale | 9,100,000 |  | 9,100,000 |  | 12,000,000
Accrued Liabilities [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Contingent consideration liabilities | 2,000,000 |  | 2,000,000 |  | 77,400,000
Other Noncurrent Liabilities [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Contingent consideration liabilities | $ 2,900,000 |  | $ 2,900,000 |  | $ 3,900,000

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