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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - Level 2 [Member] - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
ASSETS |  |
Investments in short-term time deposits, Estimated Fair Value | $ 67 | $ 3,064
Liabilities: |  |
Long-term debt, Estimated Fair Value | 566,582 | 634,071
Investments in short-term time deposits, Carrying Cost | 66 | 3,064
Long-term debt, Carrying Cost | 580,547 | 656,360
Long Term Notes Receivable from Municipalities [Member] |  |
ASSETS |  |
Notes receivable, Estimated Fair Value | 5,444 | 6,961
Liabilities: |  |
Notes receivable, Carrying Cost | $ 5,392 | $ 6,514

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