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Investments - Summary of Fair Value of Investments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	$ 26,947	$ 26,815
Acquisition-related contingent consideration	311	252
Total liabilities at fair value	311	252
Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	11,395	12,915
Acquisition-related contingent consideration	0	0
Total liabilities 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	15,552	13,900
Acquisition-related contingent consideration	0	0
Total liabilities at fair value	0	0
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	311	252
Total liabilities at fair value	311	252
Short-term investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	23,051	24,863
Short-term investments | U.S. Treasury, short-term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	9,997	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	3,492	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	5,867	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	3,695	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		697
Short-term investments | Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	9,997	12,915
Short-term investments | Quoted Prices in Active Markets (Level 1) | U.S. Treasury, short-term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	9,997	12,915
Short-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Commercial paper | Financial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Short-term investments | Quoted Prices in Active Markets (Level 1) | Commercial paper | Industrial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value		0
Short-term investments | Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	13,054	11,948
Short-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury, short-term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	3,492	3,963
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	5,867	4,445
Short-term investments | Significant Other Observable Inputs (Level 2) | Commercial paper | Financial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	3,695	2,843
Short-term investments | Significant Other Observable Inputs (Level 2) | Commercial paper | Industrial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value		697
Short-term investments | Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Short-term investments | Significant Unobservable Inputs (Level 3) | U.S. Treasury, short-term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Short-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Short-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Industrial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Short-term investments | Significant Unobservable Inputs (Level 3) | Commercial paper | Financial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Short-term investments | Significant Unobservable Inputs (Level 3) | Commercial paper | Industrial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value		0
Long-term investments | U.S. Treasury, short-term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	1,398
Long-term investments | Corporate debt securities | Financial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value		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	2,498	1,450
Long-term investments | Quoted Prices in Active Markets (Level 1) | U.S. Treasury, short-term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	1,398
Long-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Financial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value		0
Long-term investments | Quoted Prices in Active Markets (Level 1) | Corporate debt securities | Industrial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0	0
Long-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury, short-term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0
Long-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Financial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value		502
Long-term investments | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Industrial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	2,498	1,450
Long-term investments | Significant Unobservable Inputs (Level 3) | U.S. Treasury, short-term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value	0
Long-term investments | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Financial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets at fair value		0
Long-term investments | Significant Unobservable Inputs (Level 3) | 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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