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Intangible Assets - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Finite-Lived Intangible Assets, Net [Abstract]        
Amortization expense $ 800,000 $ 800,000 $ 1,600,000 $ 1,600,000
Impairment of long-lived assets $ 0 $ 0 $ 0 $ 0