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Summary of Significant Accounting Policies - Schedule of short-term debt (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Carrying Amount |  |
Current long-term debt | $ 1,410 | $ 2,566
Long-term debt | 84,709 | 103,976
Fair Value, Inputs, Level 2 |  |
Carrying Amount |  |
Long-term debt | 83,805 | 126,753
Estimated Fair Value |  |
Current long-term debt | 1,388 | 2,325
Long-term debt | $ 77,015 | $ 115,851

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