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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 297,928,000 $ 309,505,000 $ 309,505,000
Impairment expense $ 0 $ 0