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Marketable Securities (Details) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 USD ($) Security | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Total Number of Securities | 19 |  |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale | $ | $ 32,032 | $ 87,105 | $ 73,706
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 19 |  |
Current Assets |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-For-Sale Securities, Next Twelve Months, Maximum Year Mature | 1 year |  |
Non-current Assets |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for sale Securities, Debt Maturities, Year Two Through Five, Maximum Year Mature | 2 years |  |

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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