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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - Fair Value Hierarchy Level 2 [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable from municipalities, Estimated Fair Value $ 13,100 $ 13,458
Investments in short-term time deposits, Estimated Fair Value 13,468 8,883
Long-term debt, Estimated Fair Value (928,618) (1,094,987)
Carrying Cost [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable from municipalities, Carrying Cost 12,346 13,462
Investments in short-term time deposits, Carrying Cost 13,509 8,874
Long-term debt, Carrying Cost $ (867,377) $ (1,095,292)