Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012
Cash and cash equivalents, Carrying Cost	$ 95,842	$ 48,556	$ 60,972	$ 61,829
Notes receivable from municipalities, Carrying Cost	15,103	8,114
Long-term debt, including current portion, Carrying Cost	(665,000)	(550,000)
Fair Value, Inputs, Level 2 [Member]
Notes receivable from municipalities, Estimated Fair Value	15,812	6,718
Long-term debt, including current portion, Estimated Fair Value	$ (711,318)	$ (588,297)

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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