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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	Jun. 30, 2024	Sep. 30, 2023
Financial assets:
Total financial assets	$ 94,421	$ 58,862
Financial liabilities:
Cross-currency interest rate swaps	440
Cross Currency Interest Rate Swaps [Member]
Financial assets:
Cross-currency interest rate swaps	1,400	5,389
Financial liabilities:
Cross-currency interest rate swaps	440
Level 1 [Member]
Financial assets:
Total financial assets	93,021	53,473
Level 2 [Member]
Financial assets:
Total financial assets	1,400	5,389
Financial liabilities:
Cross-currency interest rate swaps	440
Level 2 [Member] | Cross Currency Interest Rate Swaps [Member]
Financial assets:
Cross-currency interest rate swaps	1,400	5,389
Financial liabilities:
Cross-currency interest rate swaps	440
Investments in Banks and Financial Institutions [Member]
Financial assets:
Investments	63,166	28,560
Investments in Banks and Financial Institutions [Member] | Level 1 [Member]
Financial assets:
Investments	63,166	28,560
Equity Securities [Member]
Financial assets:
Equity securities	29,855	24,913
Equity Securities [Member] | Level 1 [Member]
Financial assets:
Equity securities	$ 29,855	$ 24,913

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