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Stock-based Compensation Expense Summary of Restricted Stock Award and Restricted Stock Unit Activity (Details) - $ / shares
6 Months Ended
Jul. 31, 2016
Jan. 31, 2016
Restricted Stock Units (RSUs) and Performance Shares    
Unvested Restricted Stock Units    
Unvested restricted stock units at January 31, 2016 (shares) 7,739,600  
Granted (shares) 1,538,800  
Vested (shares) (1,008,000)  
Canceled/Forfeited (shares) (475,700)  
Unvested restricted stock units at July 31, 2016 (shares) 7,765,000  
Weighted average grant date fair value per share    
Unvested restricted stock units at January 31, 2016 (usd per share) $ 51.80  
Granted (in usd per share) 57.60  
Vested (in usd per share) 56.00  
Canceled/Forfeited (in usd per share) 51.70  
Unvested restricted stock units at July 31, 2016 (usd per share) $ 52.66  
Performance Stock Unit    
Unvested Restricted Stock Units    
Granted (shares) 400,000  
Performance adjustment (shares) [1] (29,700)  
Weighted average grant date fair value per share    
Performance adjustment (in usd per share) [1] $ 63.81  
Minimum | Restricted Stock Units (RSUs) and Performance Shares    
Weighted average grant date fair value per share    
Performance shares units payout 86.10%  
Maximum | Restricted Stock Units (RSUs) and Performance Shares    
Weighted average grant date fair value per share    
Performance shares units payout   98.00%
[1] Based on Autodesk's financial results and relative total stockholder return for the fiscal 2016 performance period. The performance stock units were attained at rates ranging from 86.1% to 98.0% of the target award.