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Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract]        
Amortization of intangible assets $ 0.3 $ 0.3 $ 0.7 $ 0.7