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Investments - Summary of Investments by Type of Security (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Schedule Of Available For Sale Securities [Line Items]
Cost	$ 28,251	$ 23,924
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(31)	(6)
Fair Market Value	28,221	23,921
Corporate debt securities [Member] | Short-term [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	12,245	23,924
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(4)	(6)
Fair Market Value	12,242	$ 23,921
Corporate debt securities [Member] | Long-term [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	2,302
Gross Unrealized Losses	(4)
Fair Market Value	2,298
Government debt securities [Member] | Short-term [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	7,677
Gross Unrealized Losses	(11)
Fair Market Value	7,666
Government debt securities [Member] | Long-term [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	6,027
Gross Unrealized Losses	(12)
Fair Market Value	$ 6,015

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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