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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Cash and cash equivalents, Carrying Cost $ 115,287 $ 48,556 $ 61,829 $ 74,539
Notes receivable from municipalities, Carrying Cost 15,228 8,114    
Long-term debt, including current portion, Carrying Cost (710,000) (550,000)    
Fair Value, Inputs, Level 2 [Member]
       
Notes receivable from municipalities, Estimated Fair Value 15,988 6,718    
Long-term debt, including current portion, Estimated Fair Value $ (752,513) $ (588,297)