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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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