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Changes in Fair Value of Company Level 3 Financial Instruments (Details) - Nonrecurring - Significant Unobservable (Level 3) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Balance | $ 10,962 | $ 9,940
Fair value adjustments | (3,524) | 1,100
Payment of contingent consideration | (1,421) | (78)
Contingent consideration | 6,017 |
Less: Consideration payable | (807) |
Balance | $ 5,210 | $ 10,962

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