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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Member] - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | $ 40,371 | $ 2,035
Liabilities measured at fair value |  | 829
Available-for-sale securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 3,933 |
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 40,371 | 2,035
Significant Other Observable Inputs (Level 2) [Member] | Available-for-sale securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 3,933 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Liabilities measured at fair value |  | 829
Cash equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 36,255 | 2,035
Cash equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 36,255 | 2,035
Contingent consideration [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Liabilities measured at fair value |  | 829
Contingent consideration [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Liabilities measured at fair value |  | $ 829
Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 183 |
Interest Rate Swap [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | $ 183 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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