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INVESTMENTS - SUMMARY OF FAIR VALUE OF INVESTMENTS MEASURED ON A RECURRING BASIS (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | $ 34,059 | $ 26,815
Acquisition-related contingent consideration | 354 | 252
Total liabilities at fair value | 354 | 252
Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 30,279 | 24,863
Short-term investments | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,894 | 12,915
Short-term investments | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,041 | 3,963
Short-term investments | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 9,503 | 4,445
Short-term investments | Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 10,850 | 2,843
Short-term investments | Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 2,991 | 697
Long-term investments | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 |
Long-term investments | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 1,858 | 502
Long-term investments | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 1,922 | 1,450
Quoted Prices in Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,894 | 12,915
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,894 | 12,915
Quoted Prices in Active Markets (Level 1) | Short-term investments | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,894 | 12,915
Quoted Prices in Active Markets (Level 1) | Short-term investments | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | Short-term investments | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | Short-term investments | Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | Short-term investments | Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | Long-term investments | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 |
Quoted Prices in Active Markets (Level 1) | Long-term investments | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Quoted Prices in Active Markets (Level 1) | Long-term investments | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 30,165 | 13,900
Acquisition-related contingent consideration | 0 | 0
Total liabilities at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 26,385 | 11,948
Significant Other Observable Inputs (Level 2) | Short-term investments | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Short-term investments | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 3,041 | 3,963
Significant Other Observable Inputs (Level 2) | Short-term investments | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 9,503 | 4,445
Significant Other Observable Inputs (Level 2) | Short-term investments | Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 10,850 | 2,843
Significant Other Observable Inputs (Level 2) | Short-term investments | Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 2,991 | 697
Significant Other Observable Inputs (Level 2) | Long-term investments | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 |
Significant Other Observable Inputs (Level 2) | Long-term investments | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 1,858 | 502
Significant Other Observable Inputs (Level 2) | Long-term investments | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 1,922 | 1,450
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Acquisition-related contingent consideration | 354 | 252
Total liabilities at fair value | 354 | 252
Significant Unobservable Inputs (Level 3) | Short-term investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Short-term investments | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Short-term investments | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Short-term investments | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Short-term investments | Commercial paper | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Short-term investments | Commercial paper | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Long-term investments | US Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 |
Significant Unobservable Inputs (Level 3) | Long-term investments | Corporate debt securities | Financial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Long-term investments | Corporate debt securities | Industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets at fair value | $ 0 | $ 0

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