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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 6,141  
2019 23,373  
2020 20,849  
2021 14,745  
2022 11,842  
Thereafter 29,245  
Net Book Value $ 106,195 $ 83,520