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LEASES - Future Maturities of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]    
2021 $ 7,196  
2022 6,672  
2023 5,645  
2024 4,242  
2025 3,499  
2026 and future years 8,261  
Total future lease payments 35,515  
Less: Imputed interest 3,035  
Operating lease liability 32,480  
Less: Current portion of operating lease liability 6,513 $ 0
Long-term portion of operating lease liability $ 25,967