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INCOME TAXES - Reconciliation of the Change in Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits at October 1, $ 960 $ 1,678 $ 13,440
Gross decreases - current period effect of tax positions (534) (718) (11,648)
Gross increases - current period effect of tax positions 6 0 0
Expiration of statute of limitations for assessments (185) 0 (114)
Unrecognized tax benefits at September 30,  $ 247 $ 960 $ 1,678