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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, 2022
Sep. 30, 2021
ASSETS    
Investments in short-term time deposits, Estimated Fair Value $ 8,026 $ 11,587
Liabilities:    
Long-term debt, Estimated Fair Value 646,696 812,866
Investments in short-term time deposits, Carrying Cost 7,893 11,580
Long-term debt, Carrying Cost 712,054 736,706
Long Term Notes Receivable from Municipalities [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 9,010 11,413
Liabilities:    
Notes receivable, Carrying Cost $ 8,992 10,193
Long Term Notes Receivable from Sale of Disposal Groups [Member]    
ASSETS    
Notes receivable, Estimated Fair Value   6,288
Liabilities:    
Notes receivable, Carrying Cost   $ 6,061