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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, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Leases [Abstract]          
Weighted-average discount rate 2.67%   2.67%   2.45%
Weighted-average remaining lease term (years) 8 years 4 months 28 days   8 years 4 months 28 days   8 years 9 months 10 days
Lease expense $ 998 $ 992 $ 1,917 $ 2,017  
Short-term and variable lease cost 23 30 44 23  
Sublease income (351) (269) (703) (639)  
Total lease cost for operating leases $ 670 $ 753 $ 1,258 $ 1,401