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Income Taxes - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]      
Uncertain tax positions $ 1,449,000 $ 0 $ 0
Increase from current period positions 107,000    
Interest expense 252,000    
Gross unrecognized tax benefits $ 1,701,000