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Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 08, 2016 | Nov. 30, 2015 | Nov. 30, 2014 | Nov. 30, 2015 | Nov. 30, 2014 | Sep. 30, 2015 | Aug. 04, 2015 | Jan. 13, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Basic earnings per share from discontinued operations (in dollars per share) |  | $ 2.06 |  | $ 2.01 |  |  |  |
Diluted earnings per share from discontinued operations (in dollars per share) |  | $ 2.03 |  | $ 1.98 |  |  |  |
Basic and diluted earnings per share from discontinued operations (dollars per share) |  |  | $ 0.14 |  | $ 0.18 |  |  |
Options granted and excluded from the computation of diluted earnings per share (shares) |  | 300 | 500 | 400 | 600 |  |  |
Shares |  | 2,109 |  | 4,474 |  | 5,900 |  |
Avg. Price per Share (in dollars per share) |  | $ 85.53 |  | $ 85.59 |  | $ 84.07 |  |
Purchase Price |  | $ 180,390,000 |  | $ 382,918,000 |  | $ 500,000,000 |  |
Employee payroll taxes due on restricted stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Shares | 0 |  |  | 200 |  |  |  |
Avg. Price per Share (in dollars per share) |  |  |  | $ 85.63 |  |  |  |
Purchase Price |  | $ 300,000 |  | $ 19,400,000 |  |  |  |
January 13, 2015 |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  |  | $ 500,000,000.0
Shares |  | 713 |  | 3,078 |  |  |  |
Avg. Price per Share (in dollars per share) |  | $ 84.74 |  | $ 85.44 |  |  |  |
Purchase Price |  | $ 60,409,000 |  | $ 262,937,000 |  |  |  |
August 4, 2015 |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  | $ 500,000,000.0 |
Shares |  | 1,396 |  | 1,396 |  |  |  |
Avg. Price per Share (in dollars per share) |  | $ 85.94 |  | $ 85.94 |  |  |  |
Purchase Price |  | $ 119,981,000 |  | $ 119,981,000 |  |  |  |

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