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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 $ 23,187  
2020 21,061  
2021 14,752  
2022 11,839  
2023 9,423  
Thereafter 19,694  
Net Book Value $ 99,956 $ 83,504