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Goodwill and Intangible Assets, Net - Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 78,345  
2022 63,819  
2023 46,672  
2024 38,954  
2025 34,534  
Thereafter 34,010  
Total $ 296,334 $ 205,162