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Financial Instruments and Fair Value Measurements (Financial Assets that are Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016
--- | --- | ---
Total financial assets | $ 94,293 | $ 100,717
Fair Value, Inputs, Level 1 [Member] |  |
Total financial assets | 94,293 | 100,717
Fair Value, Inputs, Level 2 [Member] |  |
Total financial assets | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Total financial assets | 0 | 0
Cash [Member] |  |
Cash and cash equivalents | 71,314 | 80,959
Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and cash equivalents | 71,314 | 80,959
Cash [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash and cash equivalents | 0 | 0
Cash [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash and cash equivalents | 0 | 0
Investments in Money Market Funds [Member] |  |
Cash and cash equivalents | 0 | 48
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and cash equivalents | 0 | 48
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash and cash equivalents | 0 | 0
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash and cash equivalents | 0 | 0
Investments in Reverse Repurchase Agreements [Member] |  |
Cash and cash equivalents | 167 | 83
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and cash equivalents | 167 | 83
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash and cash equivalents | 0 | 0
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash and cash equivalents | 0 | 0
Investments in Term Deposits with Foreign Banks [Member] |  |
Cash and cash equivalents | 7,472 | 7,136
Investments in Term Deposits with Foreign Banks [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and cash equivalents | 7,472 | 7,136
Investments in Term Deposits with Foreign Banks [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash and cash equivalents | 0 | 0
Investments in Term Deposits with Foreign Banks [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash and cash equivalents | 0 | 0
Equity Securities [Member] |  |
Equity securities | 15,340 | 12,491
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 15,340 | 12,491
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities | 0 | 0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities | $ 0 | $ 0

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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