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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Jul. 31, 2019
Aug. 23, 2019
Jan. 31, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jul. 31, 2019    
Document Transition Report false    
Entity File Number 0-21180    
Entity Registrant Name INTUIT INC    
Entity Central Index Key 0000896878    
Current Fiscal Year End Date --07-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 77-0034661    
Entity Address, Address Line One 2700 Coast Avenue    
Entity Address, City or Town Mountain View    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94043    
City Area Code 650    
Local Phone Number 944-6000    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol  INTU    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 53.7
Entity Common Stock, Shares Outstanding   260,073,642  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for its Annual Meeting of Stockholders to be held on January 23, 2020 are incorporated by reference in Part III of this Annual Report on Form 10-K.