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Basis of Presentation and Significant Accounting Policies - Summary of Activity for Contract Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Beginning balance | $ 6,902 | $ 6,208 | $ 6,461 | $ 8,965
New deposits | 268 | 385 | 1,911 | 947
Deferred revenue | 2 | (40) | 29 | (112)
Revenue recognized | (681) | (154) | (1,910) | (3,401)
Ending balance | $ 6,491 | $ 6,399 | $ 6,491 | $ 6,399

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