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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, 2023
Sep. 30, 2022
Liabilities:    
Long-term debt, Estimated Fair Value $ 661,507 $ 646,696
Investments in short-term time deposits, Carrying Cost   7,893
Long-term debt, Carrying Cost 722,671 712,054
Long Term Notes Receivable from Municipalities [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 7,794 9,010
Liabilities:    
Notes receivable, Carrying Cost 7,688 8,992
Long Term Notes Receivable from Sale of Disposal Groups [Member]    
ASSETS    
Investments in short-term time deposits, Estimated Fair Value 6,095 $ 8,026
Liabilities:    
Investments in short-term time deposits, Carrying Cost $ 6,107