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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 16,454  
2019 20,810  
2020 19,021  
2021 13,240  
2022 10,553  
Thereafter 25,679  
Net Book Value $ 105,757 $ 83,520