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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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- Definition 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 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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