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Goodwill - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Goodwill [Roll Forward]    
Balance at beginning of period $ 28,459 $ 16,859
Balance at end of period 28,459 28,459
Concorde    
Goodwill [Roll Forward]    
Additions to goodwill for acquisition of Concorde $ 0 $ 11,600