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Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization (Detail)
$ in Thousands
Sep. 30, 2017
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2018 $ 18,483
2019 16,859
2020 15,095
2021 12,374
2022 $ 10,349