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 |