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Financial Instruments and Fair Value Measurements (Narrative) (Details) $ in Thousands | Jan. 31, 2020 | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Promissory note due date | Apr. 30, 2022 |  |
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 |  | 1.6 | 1.5
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 |  | 1.3 | 1.2
Interest rate used to measure promissory notes |  | 1.0 | 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 |  | 3.3 | 4.4
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 |  | $ 50,185 | $ 51,387

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