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Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets, Future Amortization Expense) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Intangible Assets, Net    
Future Amortization Expense, Remainder of Fiscal Year $ 12,513  
2019 23,165  
2020 20,407  
2021 18,405  
2022 16,253  
Thereafter 68,705  
Finite-Lived Intangible Assets, Net, Total $ 159,448 $ 171,882