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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable from municipalities, Carrying Cost $ 13,143 $ 13,462
Investments in short-term time deposits, Carrying Cost 10,168 8,874
Long-term debt, excluding current portion, Carrying Cost (1,027,659) (1,095,292)
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable from municipalities, Estimated Fair Value 13,473 13,458
Investments in short-term time deposits, Estimated Fair Value 10,163 8,883
Long-term debt, excluding current portion, Estimated Fair Value $ (1,017,257) $ (1,094,987)