Supplemental Financial Statement Data (Narrative) (Details) - $ / shares	3 Months Ended								12 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Supplemental Financial Statement Data [Abstract]
Dividends paid per share (usd per share)	$ 0.52	$ 0.52	$ 0.52	$ 0.52	$ 0.47	$ 0.47	$ 0.47	$ 0.47	$ 2.08	$ 1.88	$ 1.72
Common Stock, Dividends, Per Share, Declared	$ 1.09	$ 0.52	$ 0.52	$ 0.00	$ 0.99	$ 0.47	$ 0.47	$ 0.00	$ 2.13	$ 1.93	$ 1.76