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LEASES - Certain Information Related to Lease Costs for Operating Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Leases [Abstract]    
Operating lease cost $ 4,286 $ 8,557
Short-term lease cost 462 1,069
Total lease cost $ 4,748 $ 9,626