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OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Undiscounted Future Minimum Operating Lease Payments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]    
2022 $ 4,687  
2023 4,180  
2024 4,152  
2025 4,027  
2026 3,195  
Thereafter 21,732  
Total undiscounted future minimum lease payments 41,973  
Discount (5,423)  
Total operating lease liabilities $ 36,550 $ 27,100