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OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Lease Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Leases [Abstract]    
Weighted-average discount rate 2.35%  
Weighted-average remaining lease term (years) 10 years 4 months 28 days  
Lease expense $ 4,431 $ 4,310
Short-term and variable lease cost 194 193
ROU asset impairment 670 224
Sublease income (1,267) (591)
Total lease cost for operating leases $ 4,028 $ 4,136