v3.8.0.1
Document and Entity Information - shares
9 Months Ended
Oct. 31, 2017
Nov. 30, 2017
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Oct. 31, 2017  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Trading Symbol ADSK  
Entity Registrant Name AUTODESK INC  
Entity Central Index Key 0000769397  
Current Fiscal Year End Date --01-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   220,266,822