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Fair Value Measurement - Change in Level 3 Assets (Details) - Recurring basis - Level 3 Assets
$ in Thousands
6 Months Ended
Mar. 31, 2020
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at September 30, 2019 $ 4,800
Change in fair value 200
Settlement (5,000)
Balance at March 31, 2020 $ 0