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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 | Jun. 30, 2018 | Sep. 30, 2017
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | $ 58,034 | $ 38,441
Liabilities measured at fair value | (12,859) | (14,864)
Available-for-sale securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 34,760 | 31,802
Cash equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 23,274 | 6,639
Contingent consideration [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (12,859) | (14,864)
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 58,034 | 38,441
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 | 34,760 | 31,802
Significant Other Observable Inputs (Level 2) [Member] | Cash equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 23,274 | 6,639
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (12,859) | (14,864)
Significant Unobservable Inputs (Level 3) [Member] | Contingent consideration [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Liabilities measured at fair value | $ (12,859) | $ (14,864)

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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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