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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2020 $ 30,729  
2021 37,494  
2022 34,390  
2023 31,267  
2024 26,500  
Thereafter 81,868  
Net Book Value $ 242,248 $ 251,168