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Debt - Long-term Debt - Current and Non-current (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Long-term Debt, by Current and Noncurrent [Abstract]    
Long-term debt $ 49,677  
Current portion of long-term debt   $ 827
Non-current portion of long-term debt $ 49,677 $ 49,588