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Goodwill and Intangible Assets, Net - Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 $ 70,138  
2021 47,114  
2022 34,940  
2023 18,904  
2024 11,186  
Thereafter 22,880  
Total $ 205,162 $ 265,249