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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - Level 2 [Member] - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
ASSETS    
Investments in short-term time deposits, Estimated Fair Value $ 6,159 $ 8,026
Liabilities:    
Long-term debt, Estimated Fair Value 674,844 646,696
Investments in short-term time deposits, Carrying Cost 6,189 7,893
Long-term debt, Carrying Cost 728,590 712,054
Long Term Notes Receivable from Municipalities [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 8,974 9,010
Liabilities:    
Notes receivable, Carrying Cost $ 8,794 $ 8,992