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Goodwill and Intangible Assets - Expected future amortization expense related to definite-lived intangible assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Estimated future amortization expense related to intangible assets subject to amortization:    
2020 $ 8,669  
2021 5,028  
2022 2,569  
2023 1,472  
2024 555  
Thereafter 665  
Definite-lived Intangible assets, Net $ 18,958 $ 28,455