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Estimated Amortization Expense for Existing Intangible Assets for Each of Five Succeeding Fiscal Years (Detail)
$ in Thousands
Sep. 30, 2015
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Remaining 2016 $ 9,226
2017 11,607
2018 11,139
2019 10,706
2020 $ 10,593