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Common Stock Repurchases (Details) (USD $)	3 Months Ended
Common Stock Repurchases (Details) (USD $)	Feb. 29, 2012	Feb. 28, 2011
Common Stock Repurchases [Abstract]
Common stock purchased and retired, shares	0	847,000
Common stock purchased and retired, value		$ 25,000,000
Amount remaining under previously authorized share repurchase programs	$ 0

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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