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Goodwill and Intangible Assets, Net - Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
2022 $ 72,119  
2023 54,156  
2024 45,882  
2025 41,930  
2026 25,505  
Thereafter 19,440  
Total $ 259,032 $ 296,334