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Estimated Amortization Expense for Existing Intangible Assets for Each of Five Succeeding Fiscal Years (Detail)
$ in Thousands
Sep. 30, 2016
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Remaining 2017 $ 9,514
2018 12,108
2019 11,789
2020 11,048
2021 $ 10,181