v3.8.0.1
Document And Entity Information - shares
3 Months Ended
Sep. 30, 2017
Oct. 27, 2017
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 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 2018  
Document Fiscal Period Focus Q1  
Entity Common Stock, Shares Outstanding   137,538,041