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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, 2017 | Sep. 30, 2016
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Cash and Cash Equivalents |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | $ 105,618 | $ 75,926
Gross Unrealized Gains | 0 | 0
Fair Value | 105,618 | 75,926
Cash and Cash Equivalents | Cash |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 90,323 | 75,486
Gross Unrealized Gains | 0 | 0
Fair Value | 90,323 | 75,486
Cash and Cash Equivalents | Money market funds |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 6,471 | 440
Gross Unrealized Gains | 0 | 0
Fair Value | 6,471 | 440
Cash and Cash Equivalents | Bank Time Deposits |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 8,824 | 0
Gross Unrealized Gains | 0 | 0
Fair Value | 8,824 | 0
Long-term Marketable Securities | Marketable equity securities |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 10,788 | 9,598
Gross Unrealized Gains | 3,003 | 1,418
Fair Value | $ 13,791 | $ 11,016

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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=75030427&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=82897076&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=82896770&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=82897076&loc=d3e27161-111563 + Details
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