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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, 2024
Sep. 30, 2023
ASSETS    
Investments in short-term time deposits, Estimated Fair Value $ 3,064 $ 6,095
Liabilities:    
Long-term debt, Estimated Fair Value 634,071 661,507
Investments in short-term time deposits, Carrying Cost 3,064 6,107
Long-term debt, Carrying Cost 656,360 722,671
Long Term Notes Receivable from Municipalities [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 6,961 7,794
Liabilities:    
Notes receivable, Carrying Cost $ 6,514 $ 7,688