Employee and Director Stock Plans - Options Outstanding (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
Jan. 31, 2014
Jan. 31, 2013
Number of securities to be issued upon exercise of outstanding options 12.5  
Weighted Average Exercise Price $ 33.54 $ 32.69
Shares available for future issuance 59.7  
Equity Compensation Plans Approved by Security Holders
    
Number of securities to be issued upon exercise of outstanding options 12.4  
Weighted Average Exercise Price $ 33.56  
Shares available for future issuance 59.7 [1]  
Equity Compensation Plans Not Approved by Security Holders
    
Number of securities to be issued upon exercise of outstanding options 0.1 [2]  
Weighted Average Exercise Price $ 24.20 [2]  
Shares available for future issuance 0 [2]  
[1] Included in this amount are 38.1 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.