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Common Stock Repurchases (Details) (USD $)	3 Months Ended	9 Months Ended
Common Stock Repurchases (Details) (USD $)	May 31, 2012	Aug. 31, 2011
Common Stock Repurchases [Abstract]
Authorized amount for share repurchase programs	$ 350,000,000
Common stock purchased and retired, shares		5,154,000
Common stock purchased and retired, value		$ 134,900,000

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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