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Summary of Significant Accounting Policies - Goodwill, Intangible Assets and Long-Lived Assets (Additional Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Impairment of goodwill | $ 0 | $ 0 | $ 0

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