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LEASES - SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]    
Operating cash flows for operating leases $ 4,539 $ 4,133
Operating cash flows for finance leases 984 952
Financing cash flows for finance leases $ 6,930 $ 5,505