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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Assets: |  |
Interest rate swap contract | $ 150 |
Liabilities: |  |
Contingent consideration liabilities | 12,364 | $ 2,960
Level 2 [Member] |  |
Assets: |  |
Interest rate swap contract | 150 |
Level 3 [Member] |  |
Liabilities: |  |
Contingent consideration liabilities | $ 12,364 | $ 2,960

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