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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Weighted-average discount rate 2.31%   2.31%  
Weighted-average remaining lease term (years) 11 years   11 years  
Lease expense $ 1,191 $ 920 $ 3,136 $ 2,533
Short-term and variable lease cost 35 118 167 452
ROU asset impairment 0 0 224 0
Sublease income (126) (188) (411) (552)
Total lease cost for operating leases $ 1,100 $ 850 $ 3,116 $ 2,433