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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable from municipalities, Carrying Cost $ 13,462 $ 14,507
Investments in short-term time deposits, Carrying Cost 8,874 8,223
Long-term debt, excluding current portion, Carrying Cost (1,095,292) (582,080)
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 13,458 15,848
Investments in short-term time deposits, Estimated Fair Value 8,883 8,227
Long-term debt, excluding current portion, Estimated Fair Value $ (1,094,987) $ (592,317)