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Revenue from Contracts with Customers - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]        
Amortization of capitalized contract acquisition costs $ 9,700,000 $ 8,600,000 $ 28,782,000 $ 25,223,000
Capitalized Contract Cost, Impairment Loss     $ 0 $ 0