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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Sep. 30, 2015
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Significant Other Observable Inputs (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | $ 28,221 | $ 23,921
Significant Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Acquisition-related contingent consideration | 267 | 47
Total liabilities at fair value | 267 | 47
Short-term [Member] | Significant Other Observable Inputs (Level 2) | Corporate debt securities [Member] | Industrial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | 3,569 | 9,665
Short-term [Member] | Significant Other Observable Inputs (Level 2) | Corporate debt securities [Member] | Financial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | 5,422 | 10,308
Short-term [Member] | Significant Other Observable Inputs (Level 2) | Corporate debt securities [Member] | Utility [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total |  | 1,802
Short-term [Member] | Significant Other Observable Inputs (Level 2) | Commercial paper [Member] | Industrial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total |  | 1,448
Short-term [Member] | Significant Other Observable Inputs (Level 2) | Commercial paper [Member] | Financial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | 3,251 | $ 698
Short-term [Member] | Significant Other Observable Inputs (Level 2) | Government debt securities [Member] | U.S. Treasury [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | 7,666 |
Long-term [Member] | Significant Other Observable Inputs (Level 2) | Corporate debt securities [Member] | Industrial [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | 2,298 |
Long-term [Member] | Significant Other Observable Inputs (Level 2) | Government debt securities [Member] | U.S. Treasury [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of investments measured on recurring basis, total | $ 6,015 |

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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