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Financial Instruments and Fair Value Measurements (Narrative) (Details) - Measurement Input, Discount Rate [Member] | Mar. 31, 2026 | Sep. 30, 2025
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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 | 4.5 | 4.2
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 | 3.2 | 3

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