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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Leases [Abstract]        
Weighted-average discount rate 2.37%   2.37%  
Weighted-average remaining lease term (years) 9 years 9 months 25 days   9 years 9 months 25 days  
Lease expense $ 978 $ 1,119 $ 2,974 $ 3,375
Short-term and variable lease cost 22 58 106 133
ROU asset impairment 0 670 0 670
Sublease income (368) (375) (1,040) (906)
Total lease cost for operating leases $ 632 $ 1,472 $ 2,040 $ 3,272