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Financial Instruments and Fair Value Measurements (Narrative) (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
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 1.5 2.5
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 1.2 1.7
Interest rate used to measure long-term debt 2.3  
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 4.4 5.7
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   $ 24,758
Cross currency interest rate swaps $ 51,387  
Cross Currency Interest Rate Swaps [Member] | Other Assets [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Cross currency interest rate swaps   $ 24,758
Cross Currency Interest Rate Swaps [Member] | Other Liabilities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Cross currency interest rate swaps $ 51,387