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Goodwill and Intangible Assets - Summary of Estimated Future Amortization (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2020 $ 179,549  
2021 149,980  
2022 121,431  
2023 97,522  
2024 78,873  
Thereafter 305,135  
Total amortizable intangible assets, net $ 932,490 $ 1,141,316