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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Notes receivable from municipalities, Carrying Cost $ 15,849 $ 15,638
Investments in short-term time deposits, Carrying Cost 4,918 0
Short-term borrowings, Carrying Cost (150,000) (2,430)
Long-term debt, excluding current portion, Carrying Cost (579,244) (850,000)
Fair Value, Inputs, Level 2 [Member]    
Notes receivable from municipalities, Estimated Fair Value 17,501 16,112
Investments in short-term time deposits, Estimated Fair Value 4,882 0
Short-term borrowings, Estimated Fair Value (150,000) (2,430)
Long-term debt, excluding current portion, Estimated Fair Value $ (617,857) $ (873,734)