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Fair Value of Company's Contingent Consideration, Investment in Debt Security and Foreign Currency Forward Contracts by Valuation Hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Contingent consideration liabilities | $ (5,210) | $ (10,962)
Fair Value, Measurements, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 9,496 |
Contingent consideration liabilities | (5,210) |
Total liabilities | (5,210) |
Contingent consideration |  | (10,962)
Fair Value, Measurements, Recurring | Significant Other Observable (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 9,496 |
Fair Value, Measurements, Recurring | Significant Unobservable (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Contingent consideration liabilities | (5,210) |
Total liabilities | (5,210) |
Contingent consideration |  | $ (10,962)
Corporate bonds | Fair Value, Measurements, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | 9,496 |
Corporate bonds | Fair Value, Measurements, Recurring | Significant Other Observable (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total assets | $ 9,496 |

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