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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Assets: |  |
Fair Value | $ 134,136 | $ 150,667
Marketable securities | 54,625 | 45,289
Cash deposits | 134,100 | 142,800
Fair Value, Measurements, Recurring |  |
Assets: |  |
Fair Value | 6 | 7,899
Marketable securities | 54,625 | 45,289
Total | 54,631 | 53,188
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1) |  |
Assets: |  |
Fair Value | 6 | 7,899
Marketable securities | 54,625 | 45,289
Total | $ 54,631 | $ 53,188

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