Supplemental Financial Statement Data (Narrative) (Details) - $ / shares	3 Months Ended								12 Months Ended
	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Supplemental Financial Statement Data [Abstract]
Dividends paid per share (usd per share)	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.37	$ 0.37	$ 0.37	$ 0.37	$ 1.60	$ 1.48	$ 1.36
Common Stock, Dividends, Per Share, Declared	$ 0.83	$ 0.40	$ 0.40	$ 0.00	$ 0.77	$ 0.37	$ 0.37	$ 0.00	$ 1.63	$ 1.51	$ 1.39