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Employee and Director Stock Plans - Options Outstanding (Details) - $ / shares shares in Millions | Jan. 31, 2017 | Jan. 31, 2016
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Number of securities to be issued upon exercise of outstanding options (in shares) |  | 8.2 |
Weighted Average Exercise Price (per share) |  | $ 39.25 | $ 37.06
Shares available for future issuance (in shares) |  | 58.9 |
Equity Compensation Plans Approved by Security Holders |  |  |
Number of securities to be issued upon exercise of outstanding options (in shares) |  | 8.2 |
Weighted Average Exercise Price (per share) |  | $ 39.25 |
Shares available for future issuance (in shares) | [1] | 58.9 |
ESP Plan |  |  |
Shares available for future issuance (in shares) |  | 45.6 |
[1] | cluded in this amount are 45.6 million securities available for future issuance under Autodesk’s ESPP.

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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=6415400&loc=d3e5070-113901 + Details
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