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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, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Leases [Abstract]          
Weighted-average discount rate 2.44%   2.44%   2.38%
Weighted-average remaining lease term (years) 9 years 1 month 9 days   9 years 1 month 9 days   9 years 7 months 28 days
Lease expense $ 992 $ 982 $ 2,017 $ 1,996  
Short-term and variable lease cost 30 42 23 84  
Sublease income (269) (339) (639) (672)  
Total lease cost for operating leases $ 753 $ 685 $ 1,401 $ 1,408