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Fair Value Measurements (Reconciliation of Liability) (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value at beginning of period $ 6,388 $ 9,960
Purchase price contingent consideration 2,300 1,310
Contingent consideration payments 0 (518)
Change in fair value of contingent consideration 1,377 (4,364)
Fair value at end of period $ 10,065 $ 6,388