v3.8.0.1
Document And Entity Information - shares
6 Months Ended
Dec. 31, 2017
Jan. 26, 2018
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 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 Q2  
Entity Common Stock, Shares Outstanding   134,558,474