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Financial Instruments and Fair Value Measurements (Schedule of Weighted Average Interest Rates Used to Calculate Long-Term Debt Fair Value) (Details)	Mar. 31, 2012	Sep. 30, 2011
Financial Instruments and Fair Value Measurements
Long-term debt, weighted-average interest rate used to estimate fair value	2.50%	2.60%

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- Definition

Represents the weighted average interest rates used to estimate fair value of long-term debt at fixed interest rates calculated based on a model that discounted future principal and interest payments at interest rates available to the company at the end of the period for similar debt of the same maturity.

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