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Revenue from Contracts with Customers - Capitalized Commission Cost (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]      
Capitalized Contract Cost, Net $ 44,900,000 $ 38,600,000  
Capitalized Contract Cost, Amortization 6,000,000 5,700,000 $ 5,000,000
Capitalized Contract Cost, Impairment Loss $ 0 $ 0 $ 0