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Shareholders' Equity (Schedule of Activity) (Details) - $ / shares shares in Thousands | 12 Months Ended |
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017
Restricted stock and performance share units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares, outstanding | 8,558 | 9,077
Weighted-average grant-date fair value per share, outstanding | $ 70.47 | $ 68.61
Shares, granted | 3,598 |
Weighted-average grant-date fair value per share, granted | $ 74.73 |
Shares, vested/exercised | (2,525) |
Weighted-average grant-date fair value per share, vested/exercised | $ 71.55 |
Shares, forfeited or expired | (1,592) |
Weighted-average grant-date fair value per share, forfeited or expired | $ 68.59 |
Restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares, outstanding | 24,153 | 24,276
Weighted-average grant-date fair value per share, outstanding | $ 66.69 | $ 65.52
Shares, granted | 8,570 |
Weighted-average grant-date fair value per share, granted | $ 67.54 |
Shares, vested/exercised | (5,440) |
Weighted-average grant-date fair value per share, vested/exercised | $ 63.02 |
Shares, forfeited or expired | (3,253) |
Weighted-average grant-date fair value per share, forfeited or expired | $ 66.28 |

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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