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Investments - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]        
Proceeds from equity offering $ 49,500 $ 49,153 $ 0 $ 0