Supplemental Financial Statement Data (Narrative) (Details) - $ / shares	3 Months Ended								12 Months Ended
	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Supplemental Financial Statement Data [Abstract]
Dividends paid per share (usd per share)	$ 0.43	$ 0.43	$ 0.43	$ 0.43	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 1.72	$ 1.60	$ 1.48
Common Stock, Dividends, Per Share, Declared	$ 0.90	$ 0.43	$ 0.43	$ 0.00	$ 0.83	$ 0.40	$ 0.40	$ 0.00	$ 1.76	$ 1.63	$ 1.51