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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021 $ 38,723  
2022 35,459  
2023 32,158  
2024 27,260  
2025 21,872  
Thereafter 62,853  
Net Book Value $ 218,325 $ 251,168