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