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, 2022	Sep. 30, 2021
Financial assets:
Total financial assets	$ 98,573	$ 42,901
Financial liabilities:
Total financial liabilities		50,185
Cross Currency Interest Rate Swaps [Member]
Financial assets:
Cross currency interest rate swaps	38,168
Financial liabilities:
Cross currency interest rate swaps		50,185
Investments in Term Deposits with Foreign Banks [Member]
Financial assets:
Investments	37,605	13,187
Equity Securities [Member]
Financial assets:
Equity securities	22,800	29,714
Level 1 [Member]
Financial assets:
Total financial assets	60,405	42,901
Level 1 [Member] | Investments in Term Deposits with Foreign Banks [Member]
Financial assets:
Investments	37,605	13,187
Level 1 [Member] | Equity Securities [Member]
Financial assets:
Equity securities	22,800	29,714
Level 2 [Member]
Financial assets:
Total financial assets	38,168
Financial liabilities:
Total financial liabilities		50,185
Level 2 [Member] | Cross Currency Interest Rate Swaps [Member]
Financial assets:
Cross currency interest rate swaps	$ 38,168
Financial liabilities:
Cross currency interest rate swaps		$ 50,185