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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2020 $ 20,942  
2021 38,689  
2022 35,417  
2023 32,128  
2024 27,314  
Thereafter 81,605  
Net Book Value $ 236,095 $ 251,168