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Estimated Amortization Expense for Existing Intangible Assets for Each of Five Succeeding Fiscal Years (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Remaining 2019 $ 12,200
2020 16,000
2021 14,700
2022 12,900
2023 $ 12,500