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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, 2020
Sep. 30, 2019
ASSETS    
Investments in short-term time deposits, Estimated Fair Value $ 13,678 $ 13,468
Liabilities:    
Long-term debt, Estimated Fair Value 935,610 928,618
Investments in short-term time deposits, Carrying Cost 13,671 13,509
Long-term debt, Carrying Cost 840,654 867,377
Long Term Notes Receivable from Municipalities [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 13,413 13,100
Liabilities:    
Notes receivable, Carrying Cost 11,846 $ 12,346
Long Term Notes Receivable from Sale of Disposal Groups [Member]    
ASSETS    
Notes receivable, Estimated Fair Value 6,341  
Liabilities:    
Notes receivable, Carrying Cost $ 6,061