Financial Instruments and Fair Value Measurements (Financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Financial assets:
Total financial assets	$ 74,226	$ 58,862
Financial liabilities:
Total financial liabilities	12,362
Cross Currency Interest Rate Swaps [Member]
Financial assets:
Cross-currency interest rate swaps		5,389
Financial liabilities:
Cross-currency interest rate swaps	12,362
Level 1 [Member]
Financial assets:
Total financial assets	74,226	53,473
Level 2 [Member]
Financial assets:
Total financial assets		5,389
Financial liabilities:
Total financial liabilities	12,362
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	12,362
Investments in Banks and Financial Institutions [Member]
Financial assets:
Investments	45,257	28,560
Investments in Banks and Financial Institutions [Member] | Level 1 [Member]
Financial assets:
Investments	45,257	28,560
Equity Securities [Member]
Financial assets:
Equity securities	28,969	24,913
Equity Securities [Member] | Level 1 [Member]
Financial assets:
Equity securities	$ 28,969	$ 24,913