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OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Leases [Abstract]        
Weighted-average discount rate 2.34%   2.34%  
Weighted-average remaining lease term (years) 10 years 6 months 25 days   10 years 6 months 25 days  
Lease expense $ 1,119 $ 1,191 $ 3,375 $ 3,136
Short-term and variable lease cost 58 35 133 167
ROU asset impairment 670 0 670 224
Sublease income (375) (126) (906) (411)
Total lease cost for operating leases $ 1,472 $ 1,100 $ 3,272 $ 3,116