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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 | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Financial assets: |  |
Total financial assets | $ 125,302 | $ 144,335
Financial liabilities: |  |
Total financial liabilities | 25,440 |
Cross Currency Interest Rate Swaps [Member] |  |
Financial assets: |  |
Cross-currency interest rate swaps |  | 24,758
Financial liabilities: |  |
Cross-currency interest rate swaps | 25,440 |
Cash [Member] |  |
Financial assets: |  |
Cash | 52,577 | 52,971
Investments in Reverse Repurchase Agreements [Member] |  |
Financial assets: |  |
Investments |  | 886
Investments in Term Deposits with Foreign Banks [Member] |  |
Financial assets: |  |
Investments | 48,786 | 45,216
Equity Securities [Member] |  |
Financial assets: |  |
Equity securities | 23,939 | 20,504
Level 1 [Member] |  |
Financial assets: |  |
Total financial assets | 125,302 | 119,577
Level 1 [Member] | Cash [Member] |  |
Financial assets: |  |
Cash | 52,577 | 52,971
Level 1 [Member] | Investments in Reverse Repurchase Agreements [Member] |  |
Financial assets: |  |
Investments |  | 886
Level 1 [Member] | Investments in Term Deposits with Foreign Banks [Member] |  |
Financial assets: |  |
Investments | 48,786 | 45,216
Level 1 [Member] | Equity Securities [Member] |  |
Financial assets: |  |
Equity securities | 23,939 | 20,504
Level 2 [Member] |  |
Financial assets: |  |
Total financial assets |  | 24,758
Financial liabilities: |  |
Total financial liabilities | 25,440 |
Level 2 [Member] | Cross Currency Interest Rate Swaps [Member] |  |
Financial assets: |  |
Cross-currency interest rate swaps |  | $ 24,758
Financial liabilities: |  |
Cross-currency interest rate swaps | $ 25,440 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + 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 No definition available. + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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