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OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Sep. 30, 2025
Leases [Abstract]    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Operating lease, right-of-use asset $ 21,900 $ 22,700
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Accrued expenses and other liabilities Accrued expenses and other liabilities
Operating lease, liability $ 23,194 $ 24,000