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INCOME TAXES - Reconciliation of the Change in Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits at October 1, $ 1,678 $ 13,440 $ 15,759
Gross decreases - current period effect of tax positions (718) (11,648) (2,338)
Gross increases - current period effect of tax positions 0 0 20
Expiration of statute of limitations for assessments 0 (114) (1)
Unrecognized tax benefits at September 30,  $ 960 $ 1,678 $ 13,440