Cover Page - shares	6 Months Ended
	Dec. 31, 2019	Jan. 30, 2020
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 31, 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 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
Entity Common Stock, Shares Outstanding		121,491,859
Amendment Flag	false
Entity Central Index Key	0001609702
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2