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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Notes receivable from municipalities, Carrying Cost $ 15,499 $ 15,849
Investments in short-term time deposits, Carrying Cost 7,368 4,918
Long-term debt, excluding current portion, Carrying Cost (576,034) (579,244)
Fair Value, Inputs, Level 2 [Member]    
Notes receivable from municipalities, Estimated Fair Value 15,736 17,501
Investments in short-term time deposits, Estimated Fair Value 7,390 4,882
Long-term debt, excluding current portion, Estimated Fair Value $ (566,990) $ (617,857)