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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, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Leases [Abstract]          
Weighted-average discount rate 2.67%   2.67%   2.65%
Weighted-average remaining lease term (years) 7 years 5 months 8 days   7 years 5 months 8 days   7 years 11 months 19 days
Lease expense $ 908 $ 998 $ 1,802 $ 1,917  
Short-term and variable lease cost 28 23 57 44  
Sublease income (399) (351) (811) (703)  
Total lease cost for operating leases $ 537 $ 670 $ 1,048 $ 1,258