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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2025
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Income taxes payable, increase | $ 12.1 |  |
Effective income tax rate | 22.90% | 23.00% |
Forecast |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Expected increase in income tax payable and net deferred tax assets |  |  | $ 52.7

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