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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

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