Employee and Director Stock Plans - Options Outstanding (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	Jan. 31, 2015		Jan. 31, 2014
Number of securities to be issued upon exercise of outstanding options	10.5
Weighted Average Exercise Price	$ 34.46		$ 33.54
Shares available for future issuance	55.0
Equity Compensation Plans Approved by Security Holders
Number of securities to be issued upon exercise of outstanding options	10.5
Weighted Average Exercise Price	$ 34.46
Shares available for future issuance	55.0	[1]

[1] Included in this amount are 40.7 million securities available for future issuance under Autodesk’s ESP Plan.