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Other Assets, Net - Schedule of Estimated Amortization of Identified Intangible Assets (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
2018 $ 15,119
2019 12,032
2020 10,105
2021 6,664
2022 $ 5,312