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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 $ 17,993  
2020 41,339  
2021 37,546  
2022 34,545  
2023 31,589  
Thereafter 107,781  
Net Book Value $ 270,793 $ 99,956