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Financial Instruments and Fair Value Measurements (Financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Financial assets: |  |
Total financial assets | $ 53,910 | $ 58,862
Financial liabilities: |  |
Total financial liabilities | 12,004 |
Investments in Banks and Financial Institutions [Member] |  |
Financial assets: |  |
Investments in term deposits with foreign banks | 23,128 | 28,560
Equity Securities [Member] |  |
Financial assets: |  |
Equity securities | 30,782 | 24,913
Cross Currency Interest Rate Swaps [Member] |  |
Financial assets: |  |
Cross currency interest rate swaps |  | 5,389
Financial liabilities: |  |
Cross currency interest rate swaps | 12,004 |
Level 1 [Member] |  |
Financial assets: |  |
Total financial assets | 53,910 | 53,473
Level 1 [Member] | Investments in Banks and Financial Institutions [Member] |  |
Financial assets: |  |
Investments in term deposits with foreign banks | 23,128 | 28,560
Level 1 [Member] | Equity Securities [Member] |  |
Financial assets: |  |
Equity securities | 30,782 | 24,913
Level 2 [Member] |  |
Financial assets: |  |
Total financial assets |  | 5,389
Financial liabilities: |  |
Total financial liabilities | 12,004 |
Level 2 [Member] | Cross Currency Interest Rate Swaps [Member] |  |
Financial assets: |  |
Cross currency interest rate swaps |  | $ 5,389
Financial liabilities: |  |
Cross currency interest rate swaps | $ 12,004 |

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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