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Goodwill and Intangible Assets, Net - Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 79,916  
2019 54,007  
2020 23,163  
2021 10,356  
2022 6,534  
Thereafter 3,350  
Total $ 177,326 $ 281,527