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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, 2021
Sep. 30, 2020
ASSETS    
Investments in short-term time deposits, Estimated Fair Value $ 11,542 $ 13,678
Liabilities:    
Long-term debt, Estimated Fair Value 812,426 935,610
Investments in short-term time deposits, Carrying Cost 11,534 13,671
Long-term debt, Carrying Cost 742,048 840,654
Long Term Notes Receivable from Municipalities [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 13,416 13,413
Liabilities:    
Notes receivable, Carrying Cost 11,138 11,846
Long Term Notes Receivable from Sale of Disposal Groups [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 6,370 6,341
Liabilities:    
Notes receivable, Carrying Cost $ 6,182 $ 6,061