Financial Instruments and Fair Value Measurements (Financial Assets that are Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Financial assets:
Total financial assets	$ 67,503	$ 42,901
Financial liabilities:
Total financial liabilities	24,724	50,185
Cross Currency Interest Rate Swaps [Member]
Financial liabilities:
Cross-currency interest rate swaps	24,724	50,185
Level 1 [Member]
Financial assets:
Total financial assets	67,503	42,901
Level 2 [Member]
Financial liabilities:
Total financial liabilities	24,724	50,185
Level 2 [Member] | Cross Currency Interest Rate Swaps [Member]
Financial liabilities:
Cross-currency interest rate swaps	24,724	50,185
Investments in Term Deposits with Foreign Banks [Member]
Financial assets:
Investments	39,201	13,187
Investments in Term Deposits with Foreign Banks [Member] | Level 1 [Member]
Financial assets:
Investments	39,201	13,187
Equity Securities [Member]
Financial assets:
Equity securities	28,302	29,714
Equity Securities [Member] | Level 1 [Member]
Financial assets:
Equity securities	$ 28,302	$ 29,714