Employee and Director Stock Plans Options Outstanding (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	Jan. 31, 2013
Number of securities to be issued upon exercise of outstanding options	24.0
Weighted Average Exercise Price	$ 32.69
Shares available for future issuance	50.2
Equity Compensation Plans Approved by Security Holders
Number of securities to be issued upon exercise of outstanding options	23.8
Weighted Average Exercise Price	$ 32.88
Shares available for future issuance	50.2	[1]
Equity Compensation Plans Not Approved by Security Holders
Number of securities to be issued upon exercise of outstanding options	0.2	[2]
Weighted Average Exercise Price	$ 12.53	[2]
Shares available for future issuance	0	[2]

[1] Included in this amount are 36.2 million securities available for future issuance under Autodesk’s ESP Plan.

[2] Amounts correspond to Autodesk’s Nonstatutory Stock Option Plan, which was terminated by the Board of Directors in December 2004.