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Cash, Cash Equivalents and Marketable Securities Available for Sale - Summary of Cash, Cash Equivalents and Marketable Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
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Cash and Cash Equivalents |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | $ 75,926 | $ 86,120
Gross Unrealized Gains | 0 | 0
Fair Value | 75,926 | 86,120
Cash and Cash Equivalents | Cash |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 75,486 | 85,681
Gross Unrealized Gains | 0 | 0
Fair Value | 75,486 | 85,681
Cash and Cash Equivalents | Money market funds |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 440 | 439
Gross Unrealized Gains | 0 | 0
Fair Value | 440 | 439
Long-term Marketable Securities | Marketable equity securities |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 9,598 | 8,691
Gross Unrealized Gains | 1,418 | 876
Fair Value | $ 11,016 | $ 9,567

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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=51813488&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=27724398&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=49167202&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=27724398&loc=d3e27161-111563 + Details
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