Employee and Director Stock Plans - Options Outstanding (Details) - $ / shares shares in Millions		Jan. 31, 2017	Jan. 31, 2016
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.