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Fair Value Measurements (Reconciliation of Liability) (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value at beginning of period $ 5,407 $ 10,065
Purchase price contingent consideration 5,100 0
Contingent consideration payments (6,151) (5,848)
Change in fair value of contingent consideration (128) 1,190
Fair value at end of period $ 4,228 $ 5,407