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Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2020 $ 19,451
2021 16,944
2022 14,885
2023 13,272
2024 $ 10,919