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Goodwill and Intangible Assets - Net - Summary of Expected Amortization Expense Relating to Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2021 $ 49,802  
2022 44,347  
2023 39,219  
2024 34,227  
2025 29,281  
Thereafter 95,498  
Total $ 292,374 $ 342,418