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Estimated Amortization Expense for Existing Intangible Assets for Each of Five Succeeding Fiscal Years (Detail)
$ in Thousands
Sep. 30, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Remaining 2018 $ 10,678
2019 14,008
2020 13,052
2021 12,356
2022 $ 10,903