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Cash, Cash Equivalents and Marketable Securities Available for Sale (Tables) | 12 Months Ended
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Sep. 30, 2017
Cash and Cash Equivalents [Abstract] |
Summary of Cash, Cash Equivalents and Marketable Securities Available for Sale | The following is a summary of cash, cash equivalents and marketable securities available for sale at September 30, 2017 and 2016:
| September 30, 2017 |  | September 30, 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Fair Value
| (In thousands)
Cash and Cash Equivalents: |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 90,323 |  |  | $ | — |  |  | $ | 90,323 |  |  | $ | 75,486 |  |  | $ | — |  |  | $ | 75,486 |
Money market funds | 6,471 |  |  | — |  |  | 6,471 |  |  | 440 |  |  | — |  |  | 440 |
Bank time deposits | 8,824 |  |  | — |  |  | 8,824 |  |  | — |  |  | — |  |  | — |
Total | $ | 105,618 |  |  | $ | — |  |  | $ | 105,618 |  |  | $ | 75,926 |  |  | $ | — |  |  | $ | 75,926 |
Long-term Marketable Securities: |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities | $ | 10,788 |  |  | $ | 3,003 |  |  | $ | 13,791 |  |  | $ | 9,598 |  |  | $ | 1,418 |  |  | $ | 11,016 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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