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, 2024	Sep. 30, 2023
Financial assets:
Total financial assets	$ 234,626	$ 58,862
Financial liabilities:
Cross-currency interest rate swaps	4,968
Cross Currency Interest Rate Swaps [Member]
Financial assets:
Cross-currency interest rate swaps		5,389
Financial liabilities:
Cross-currency interest rate swaps	4,968
Level 1 [Member]
Financial assets:
Total financial assets	234,626	53,473
Level 2 [Member]
Financial assets:
Total financial assets		5,389
Financial liabilities:
Cross-currency interest rate swaps	4,968
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	4,968
Investments in Banks and Financial Institutions [Member]
Financial assets:
Investments	204,724	28,560
Investments in Banks and Financial Institutions [Member] | Level 1 [Member]
Financial assets:
Investments	204,724	28,560
Equity Securities [Member]
Financial assets:
Equity securities	29,902	24,913
Equity Securities [Member] | Level 1 [Member]
Financial assets:
Equity securities	$ 29,902	$ 24,913