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Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits |  |  |
Balance at beginning of year | $ 6,233 | $ 8,676 | $ 12,642
Decreases for lapse of statute of limitations | 0 | (2,051) | (1,412)
Decreases for settlements with taxing authorities | 0 | (692) | (4,785)
Increases for tax positions taken in current year | 7,248 | 300 | 2,231
Decreases for tax positions taken in current year | (2,589) | 0 | 0
Balance at end of year | $ 10,892 | $ 6,233 | $ 8,676

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