Common Stock Repurchases (Details) (USD $)	6 Months Ended
	May 31, 2014	May 31, 2013
Common Stock Repurchases [Abstract]
Common stock repurchased and retired (in shares)	1,600,000	7,613,000
Common stock repurchased and retired	$ 35,000,000	$ 169,500,000
Authorized amount for share repurchase programs	$ 100,000,000