Financial Instruments and Fair Value Measurements (Financial Assets that are Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Financial assets:
Total financial assets	$ 54,862	$ 98,573
Financial liabilities:
Total financial liabilities	1,987
Cross Currency Interest Rate Swaps [Member]
Financial assets:
Cross-currency interest rate swaps		38,168
Financial liabilities:
Cross-currency interest rate swaps	1,987
Level 1 [Member]
Financial assets:
Total financial assets	54,862	60,405
Level 2 [Member]
Financial assets:
Total financial assets		38,168
Financial liabilities:
Total financial liabilities	1,987
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	1,987
Investments in Term Deposits with Foreign Banks [Member]
Financial assets:
Investments	28,313	37,605
Investments in Term Deposits with Foreign Banks [Member] | Level 1 [Member]
Financial assets:
Investments	28,313	37,605
Equity Securities [Member]
Financial assets:
Equity securities	26,549	22,800
Equity Securities [Member] | Level 1 [Member]
Financial assets:
Equity securities	$ 26,549	$ 22,800