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Leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Leases [Abstract]          
Weighted average remaining lease term of operating leases (in years) 4 years 7 months 6 days   4 years 7 months 6 days    
Weighted average discount rate of operating leases 3.10%   3.10%    
Right-of-use assets $ 4,625 $ 6,357 $ 4,625 $ 6,357 $ 5,155
ROU liabilities 5,510   5,510   6,200
Lease liabilities, current portion 2,023 2,203 2,023 2,203 2,110
Lease liabilities, non-current portion 3,487 5,485 3,487 5,485 $ 4,106
Operating lease costs $ 500 $ 500 1,100 $ 1,100  
Operating cash flows for operating leases paid     $ 1,200