Cover Page - USD ($)
$ in Billions
12 Months Ended
Jun. 30, 2019
Aug. 09, 2019
Dec. 29, 2017
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jun. 30, 2019    
Document Transition Report false    
Entity File Number 001-36486    
Entity Registrant Name CDK Global, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 46-5743146    
Entity Address, Address Line One 1950 Hassell Road    
Entity Address, City or Town Hoffman Estates    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60169    
City Area Code 847    
Local Phone Number 397-1700    
Title of 12(b) Security Common Stock, $0.01 Par Value    
Trading Symbol CDK    
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    
Public Float     $ 6.1
Entity Common Stock, Shares Outstanding   121,199,032  
Documents Incorporated by Reference
Part III incorporates information by reference to the registrant's definitive proxy statement, to be filed with the Securities and Exchange Commission within 120 days after the fiscal year end of June 30, 2019.
Entity Central Index Key 0001609702    
Amendment Flag false    
Current Fiscal Year End Date --06-30    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY