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Financial Instruments and Fair Value Measurements (Narrative) (Details) $ in Thousands | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
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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 | 1.7 | 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 promissory notes | 3.1 |
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, assets |  | $ 24,758
Cross currency interest rate swaps, liabilities | $ 25,440 |
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, assets |  | $ 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, liabilities | $ 25,440 |

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