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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Notes receivable from municipalities, Carrying Cost $ 15,361 $ 15,849
Investments in short-term time deposits, Carrying Cost 0 4,918
Short-term borrowings, Carrying Cost (134,300) (150,000)
Long-term debt, excluding current portion, Carrying Cost (563,941) (579,244)
Fair Value, Inputs, Level 2 [Member]    
Notes receivable from municipalities, Estimated Fair Value 16,211 17,501
Investments in short-term time deposits, Estimated Fair Value 0 4,882
Short-term borrowings, Estimated Fair Value (134,300) (150,000)
Long-term debt, excluding current portion, Estimated Fair Value $ (586,706) $ (617,857)