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Financial Instruments and Fair Value Measurements (Narrative) (Details) - Measurement Input, Discount Rate [Member] | Sep. 30, 2025 | Sep. 30, 2024
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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 | 4.2 | 4.5
Long Term Notes Receivable from Municipalities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Interest rate used to measure municipal notes | 3.0 | 2.7
Investments in Short-Term Time Deposits [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 | 5.3 | 6.8

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