v3.19.1
Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Jan. 31, 2019
Mar. 15, 2019
Jul. 31, 2018
Document and Entity Information [Abstract]      
Entity Registrant Name AUTODESK INC.    
Entity Central Index Key 0000769397    
Current Fiscal Year End Date --01-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Jan. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   219,535,216  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Public Float     $ 28.1