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Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization (Detail)
$ in Thousands
Sep. 30, 2015
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2016 $ 14,968
2017 14,448
2018 13,609
2019 13,374
2020 $ 11,766