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Supporting Financial Information - Estimated Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Fiscal 2020 $ 4,723  
Fiscal 2021 4,723  
Fiscal 2022 4,723  
Fiscal 2023 4,723  
Thereafter 22,316  
Intangible assets, net $ 41,208 $ 13,365