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Goodwill and Intangible Assets - Changes in Net Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Goodwill [Roll Forward]    
Balance at beginning of period $ 3,493 $ 3,493
Goodwill impairment adjustment 0 0
Currency translation 0 0
Balance at end of period $ 3,493 $ 3,493