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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Lease, Cost [Abstract]    
Operating lease cost $ 3,783 $ 3,504
Variable lease cost 1,094 1,094
Short-term lease cost 109 127
Total lease cost $ 4,986 $ 4,725