XML 17 R1.htm IDEA: XBRL DOCUMENT v3.19.1
Document and Entity Information - USD ($)
shares in Millions, $ in Billions
 12 Months Ended
Jan. 31, 2019
Feb. 28, 2019
Jul. 31, 2018
Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol WDAY    
Entity Registrant Name Workday, Inc.    
Entity Central Index Key 0001327811    
Current Fiscal Year End Date --01-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 18.6
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Class A Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   157  
Class B Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   65