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Short-term Debt	6 Months Ended
Short-term Debt	Mar. 31, 2012
Debt Disclosure [Abstract]
Short-term Debt	Short-term Debt Our short-term debt obligations are comprised of commercial paper borrowings. Commercial paper borrowings outstanding were $259.0 million at March 31, 2012. At March 31, 2012 the weighted average interest rate and maturity period of the commercial paper outstanding were 0.26 percent and 8 days, respectively. At September 30, 2011, we had no commercial paper borrowings outstanding.

- Definition

The entire disclosure for short-term debt.

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