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OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Lease Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Leases [Abstract]      
Weighted-average discount rate 2.65% 2.45%  
Weighted-average remaining lease term (years) 7 years 11 months 19 days 8 years 9 months 10 days  
Lease expense $ 3,807 $ 3,997 $ 3,951
Short-term and variable lease cost 78 75 142
Sublease income (1,377) (1,300) (1,409)
Total lease cost for operating leases $ 2,508 $ 2,772 $ 2,684