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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable from municipalities, Carrying Cost $ 14,507 $ 15,849
Investments in short-term time deposits, Carrying Cost 8,223 4,918
Long-term debt, excluding current portion, Carrying Cost (582,080) (579,244)
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 15,848 17,501
Investments in short-term time deposits, Estimated Fair Value 8,227 4,882
Long-term debt, excluding current portion, Estimated Fair Value $ (592,317) $ (617,857)