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Discontinued Operations, Goodwill, and Intangible Assets - Amortization Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Estimated amortization expense for the succeeding years    
2021 $ 20,300  
2022 19,500  
2023 18,600  
2024 17,300  
2025 700  
Thereafter 500  
Intangible Assets, Net 76,917 $ 99,636
Amortization expense $ 24,100 $ 25,200