Supplemental Financial Statement Data (Narrative) (Details) - $ / shares	3 Months Ended								12 Months Ended
	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017
Supplemental Financial Statement Data [Abstract]
Dividends paid per share (usd per share)	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.52	$ 0.52	$ 0.52	$ 0.52	$ 2.28	$ 2.08	$ 1.88
Common Stock, Dividends, Per Share, Declared	$ 1.19	$ 0.57	$ 0.57	$ 0	$ 1.09	$ 0.52	$ 0.52	$ 0	$ 2.33	$ 2.13	$ 1.93