Document And Entity Information (USD $)
In Billions, except Share data, unless otherwise specified
12 Months Ended
Jun. 30, 2015
Aug. 10, 2015
Dec. 31, 2014
Document And Entity Information [Abstract]      
Document Type 10-K    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity well-known seasoned issuer No    
Amendment Flag false    
Document Period End Date Jun. 30, 2015    
Entity Registrant Name CDK Global, Inc.    
Entity Central Index Key 0001609702    
Current Fiscal Year End Date --06-30    
Entity Filer Category Non-accelerated Filer    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Entity Common Stock, Shares Outstanding   160,062,055  
Public Float     $ 6.6