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Income Taxes - Summary of Valuation Allowance (Details) - SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Valuation Allowance [Roll Forward] |  |  |
Balance at beginning of period | $ 3,192 | $ 1,200 | $ 13,492
Reductions to income tax | 0 | (236) | (12,075)
Write-offs/Adjustments | (1,180) | 2,228 | (217)
Balance at end of period | $ 2,012 | $ 3,192 | $ 1,200

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