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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - Level 2 [Member] - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
ASSETS    
Investments in short-term time deposits, Estimated Fair Value $ 16,537 $ 13,678
Liabilities:    
Long-term debt, Estimated Fair Value 853,830 935,610
Investments in short-term time deposits, Carrying Cost 16,521 13,671
Long-term debt, Carrying Cost 749,172 840,654
Long Term Notes Receivable from Municipalities [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 13,579 13,413
Liabilities:    
Notes receivable, Carrying Cost 10,941 11,846
Long Term Notes Receivable from Sale of Disposal Groups [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 6,341 6,341
Liabilities:    
Notes receivable, Carrying Cost $ 6,111 $ 6,061