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Employee and Director Stock Plans - Options Outstanding (Details) - $ / shares shares in Millions | Jan. 31, 2018 | Jan. 31, 2017
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Number of securities to be issued upon exercise of outstanding options (in shares) | 5.9 |
Weighted-average exercise price (per share) | $ 40.49 | $ 39.25
Shares available for future issuance (in shares) | 31.3 |
Equity Compensation Plans Approved by Security Holders |  |
Number of securities to be issued upon exercise of outstanding options (in shares) | 5.9 |
Weighted-average exercise price (per share) | $ 40.49 |
Shares available for future issuance (in shares) | 31.3 |
ESP Plan |  |
Shares available for future issuance (in shares) | 9.1 |

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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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