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OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Leases [Abstract]        
Weighted-average discount rate 2.36%   2.36%  
Weighted-average remaining lease term (years) 9 years 11 months 23 days   9 years 11 months 23 days  
Lease expense $ 982 $ 1,119 $ 1,996 $ 2,256
Short-term and variable lease cost 42 40 84 75
Sublease income (339) (355) (672) (531)
Total lease cost for operating leases $ 685 $ 804 $ 1,408 $ 1,800