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Common Stock Repurchases (Details) (USD $)	3 Months Ended
Common Stock Repurchases (Details) (USD $)	Feb. 28, 2013	Feb. 29, 2012
Common Stock Repurchases [Abstract]
Common stock repurchased and retired (in shares)	4,783,000	0
Common stock repurchased and retired	$ 106,300,000
Authorized amount for share repurchase programs	$ 350,000,000

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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