Document And Entity Information - USD ($)
$ in Billions
12 Months Ended
Jun. 30, 2017
Aug. 04, 2017
Dec. 31, 2016
Document And Entity Information [Abstract]      
Document Type 10-K    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity well-known seasoned issuer Yes    
Amendment Flag false    
Document Period End Date Jun. 30, 2017    
Entity Registrant Name CDK Global, Inc.    
Entity Central Index Key 0001609702    
Current Fiscal Year End Date --06-30    
Entity Filer Category Large Accelerated Filer    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Entity Common Stock, Shares Outstanding   140,119,000  
Public Float     $ 8.7