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Supplemental Financial Statement Data (Narrative) (Details) - $ / shares
3 Months Ended 12 Months Ended
Nov. 30, 2020
Aug. 31, 2020
May 31, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
May 31, 2019
Feb. 28, 2019
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2018
Supplemental Financial Statement Data [Abstract]                      
Dividends paid per share (usd per share) $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.29 $ 0.28 $ 0.29 $ 0.28 $ 1.24 $ 1.14 $ 1.04
Common Stock, Dividends, Per Share, Declared $ 0.65 $ 0.31 $ 0.31 $ 0 $ 0.60 $ 0.28 $ 0.29 $ 0 $ 1.27 $ 1.17 $ 1.07