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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | $ 26,815 | $ 23,921
Acquisition-related contingent consideration | 252 | 47
Total liabilities at fair value | 252 | 47
Short-term investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 24,863 |
Short-term investments [Member] | US Treasury [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 12,915 |
Short-term investments [Member] | Corporate debt securities [Member] | Financial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,963 | 10,308
Short-term investments [Member] | Corporate debt securities [Member] | Industrial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 4,445 | 9,665
Short-term investments [Member] | Corporate debt securities [Member] | Utility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value |  | 1,802
Short-term investments [Member] | Commercial paper [Member] | Financial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 2,843 | 698
Short-term investments [Member] | Commercial paper [Member] | Industrial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 697 | 1,448
Long-term [Member] | Corporate debt securities [Member] | Financial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 502 |
Long-term [Member] | Corporate debt securities [Member] | Industrial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 1,450 |
Quoted Prices in Active Markets (Level 1) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 12,915 |
Quoted Prices in Active Markets (Level 1) [Member] | Short-term investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 12,915 |
Quoted Prices in Active Markets (Level 1) [Member] | Short-term investments [Member] | US Treasury [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 12,915 |
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 13,900 | 23,921
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 11,948 |
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] | Corporate debt securities [Member] | Financial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,963 | 10,308
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] | Corporate debt securities [Member] | Industrial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 4,445 | 9,665
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] | Corporate debt securities [Member] | Utility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value |  | 1,802
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] | Commercial paper [Member] | Financial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 2,843 | 698
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] | Commercial paper [Member] | Industrial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 697 | 1,448
Significant Other Observable Inputs (Level 2) [Member] | Long-term [Member] | Corporate debt securities [Member] | Financial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 502 |
Significant Other Observable Inputs (Level 2) [Member] | Long-term [Member] | Corporate debt securities [Member] | Industrial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Assets at fair value | 1,450 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Acquisition-related contingent consideration | 252 | 47
Total liabilities at fair value | $ 252 | $ 47

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