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LEASES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Leases [Abstract]          
Weighted average remaining lease term of operating leases (in years) 4 years 8 months 12 days   4 years 8 months 12 days    
Weighted average discount rate of operating leases(as a percent) 3.10%   3.10%    
Right-of-use assets $ 4,335 $ 5,673 $ 4,335 $ 5,673 $ 5,155
ROU liabilities 5,091   5,091   6,200
Lease liabilities, current portion 2,123 2,093 2,123 2,093 2,110
Lease liabilities, non-current portion 2,968 4,776 2,968 4,776 $ 4,106
Operating lease costs $ 500 $ 600 1,500 $ 1,700  
Operating cash flows for operating leases paid     $ 1,800