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Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Other Long-term Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Other Liabilities Disclosure [Abstract] |  |
Deferred consideration | $ 5,106 | $ 2,216
Contingent consideration | 817 |
Unrecognized tax benefits | 2,538 | 2,464
Operating lease liabilities | 3,188 | 3,340
Other long-term liabilities | $ 11,649 | $ 8,020

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