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Intangible Assets - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets, Net [Abstract]      
Amortization expense $ 1,300,000 $ 1,300,000 $ 1,300,000
Impairment of long-lived assets $ 0 $ 0 $ 0