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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - Level 2 [Member] - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
ASSETS    
Investments in short-term time deposits, Estimated Fair Value $ 75 $ 3,064
Liabilities:    
Long-term debt, Estimated Fair Value 627,834 634,071
Investments in short-term time deposits, Carrying Cost 74 3,064
Long-term debt, Carrying Cost 651,556 656,360
Long Term Notes Receivable from Municipalities [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 6,298 6,961
Liabilities:    
Notes receivable, Carrying Cost $ 6,216 $ 6,514