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Fair Value Measurements (Reconciliation of Liability) (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value at beginning of period $ 10,000 $ 14,766 $ 4,228 $ 5,407
Contingent consideration recognized for acquired business 8,000 (4,000) 8,000 5,100
Contingent consideration payments (10,000) 0 (10,000) 0
Change in fair value of contingent consideration 0 (387) 5,772 (128)
Fair value at end of period $ 8,000 $ 10,379 $ 8,000 $ 10,379