Financial Instruments and Fair Value Measurements (Financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Financial assets:
Total financial assets	$ 53,830	$ 53,910
Financial liabilities:
Total financial liabilities	3,055	12,004
Cross Currency Interest Rate Swaps [Member]
Financial assets:
Cross-currency interest rate swaps	1,173
Financial liabilities:
Cross-currency interest rate swaps	3,055	12,004
Level 1 [Member]
Financial assets:
Total financial assets	52,657	53,910
Level 2 [Member]
Financial assets:
Total financial assets	1,173
Financial liabilities:
Total financial liabilities	3,055	12,004
Level 2 [Member] | Cross Currency Interest Rate Swaps [Member]
Financial assets:
Cross-currency interest rate swaps	1,173
Financial liabilities:
Cross-currency interest rate swaps	3,055	12,004
Investments in Banks and Financial Institutions [Member]
Financial assets:
Investments	18,751	23,128
Investments in Banks and Financial Institutions [Member] | Level 1 [Member]
Financial assets:
Investments	18,751	23,128
Equity Securities [Member]
Financial assets:
Equity securities	33,906	30,782
Equity Securities [Member] | Level 1 [Member]
Financial assets:
Equity securities	$ 33,906	$ 30,782