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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Sep. 30, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 $ 9,025  
2020 41,365  
2021 37,494  
2022 34,390  
2023 31,267  
Thereafter 108,654  
Net Book Value $ 262,195 $ 99,956