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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 18,026  
2019 17,076  
2020 15,244  
2021 9,730  
2022 7,418  
Thereafter 16,026  
Net Book Value $ 83,520 $ 81,843