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OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Lease Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]    
Weighted-average discount rate 2.32%  
Weighted-average remaining lease term (years) 10 years 10 months 6 days  
Lease expense $ 4,310 $ 3,454
Short-term and variable lease cost 193 496
ROU asset impairment 224 0
Sublease income (591) (733)
Total lease cost for operating leases $ 4,136 $ 3,217