Financial Instruments and Fair Value Measurements (Narrative) (Details) $ in Thousands	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Measurement Input, Discount Rate [Member] | Long-Term Debt [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Interest rate used to measure long-term debt	5.6	1.6
Long Term Notes Receivable from Municipalities [Member] | Measurement Input, Discount Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Interest rate used to measure municipal notes	3.5	1.3
Investments in Short-Term Time Deposits [Member] | Measurement Input, Discount Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Interest rate used to measure short-term time deposits	6.1	3.3
Cross Currency Interest Rate Swaps [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Cross currency interest rate swaps	$ 38,168
Cross currency interest rate swaps		$ 50,185