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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Lease, Cost [Abstract]    
Operating lease cost $ 3,815 $ 3,783
Variable lease cost 1,332 1,094
Short-term lease cost 93 109
Total lease cost $ 5,240 $ 4,986