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Derivatives and Risk Management (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Derivatives and Risk Management [Abstract]
Increase in the carrying value of debt through fair value hedge accounting for interest rate swaps	$ 45.6
Reductions in interest expense related to interest rate swaps	4.2	3.3
Notional Amount of Foreign Currency Derivatives	298
Notional amount of interest rate swap transactions	$ 800

Amount of unrealized gain (loss) included in earnings for the period related to the fair value of the hedged item in an interest rate fair value hedge, which was offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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