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Goodwill and Intangible Assets, Net - Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 92,693  
2020 61,527  
2021 42,554  
2022 30,380  
2023 14,682  
Thereafter 23,413  
Total $ 265,249 $ 177,326