Document and Entity Information - shares
3 Months Ended
Apr. 30, 2019
May 29, 2019
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Apr. 30, 2019  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
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 Emerging Growth Company false  
Entity Small Business false  
Entity Common Stock, Shares Outstanding   219,619,580