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Financial Instruments and Fair Value Measurements (Narrative) (Details) $ in Thousands | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($)
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Investments in Short-Term Time Deposits [Member] | Measurement Input, Discount Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate used to measure short-term time deposits | 4.9 | 5.7
Long Term Notes Receivable From Municipalities [Member] | Measurement Input, Discount Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate used to measure municipal notes | 1.8 | 1.7
Long-Term Debt [Member] | Measurement Input, Discount Rate [Member] | Weighted Average [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate used to measure long-term debt | 2.5 | 2.5
Cross Currency Interest Rate Swaps [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cross currency interest rate swaps, assets | $ 13,474 | $ 24,758
Cross Currency Interest Rate Swaps [Member] | Other Assets [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cross currency interest rate swaps, assets | 13,474 | 24,758
Cross Currency Interest Rate Swaps [Member] | Other Liabilities [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cross currency interest rate swaps, liabilities |  |

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