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OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Narrative (Details)
$ in Thousands
 9 Months Ended
Jun. 30, 2025
USD ($)
office
Sep. 30, 2024
USD ($)
Leases [Abstract]    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Operating lease, right-of-use asset $ 23,200 $ 24,400
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Accrued expenses and other liabilities Accrued expenses and other liabilities
Operating lease, liability $ 24,461 $ 26,000
Lease ROU assets and liabilities, number of office locations | office 2  
Gain (loss) on remeasurement of ROU asset depleted $ 500