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Fair Value Measurement - Changes in Level 3 Assets (Details) - Recurring basis - Level 3
$ in Thousands
12 Months Ended
Sep. 30, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance, contingent consideration $ 1,300
Change in fair value of earn-out liability 3,500
Ending balance, contingent consideration $ 4,800