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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, 2025
Sep. 30, 2024
Financial assets:    
Total financial assets $ 68,102 $ 53,910
Financial liabilities:    
Total financial liabilities 27,406 12,004
Investments in Banks and Financial Institutions [Member]    
Financial assets:    
Investments in term deposits with foreign banks 30,256 23,128
Equity Securities [Member]    
Financial assets:    
Equity securities 37,846 30,782
Cross Currency Interest Rate Swaps [Member]    
Financial liabilities:    
Cross currency interest rate swaps 27,406 12,004
Level 1 [Member]    
Financial assets:    
Total financial assets 68,102 53,910
Level 1 [Member] | Investments in Banks and Financial Institutions [Member]    
Financial assets:    
Investments in term deposits with foreign banks 30,256 23,128
Level 1 [Member] | Equity Securities [Member]    
Financial assets:    
Equity securities 37,846 30,782
Level 2 [Member]    
Financial liabilities:    
Total financial liabilities 27,406 12,004
Level 2 [Member] | Cross Currency Interest Rate Swaps [Member]    
Financial liabilities:    
Cross currency interest rate swaps $ 27,406 $ 12,004