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LEASES - Certain Information Related to Lease Costs for Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]    
Operating lease cost $ 13,686 $ 16,953
Short-term lease cost 3,580 1,693
Total lease cost $ 17,266 $ 18,646