Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 25, 2018
Entity Information [Line Items]
Entity Registrant Name	CERNER CORP /MO/
Entity Central Index Key	0000804753
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-29
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		329,004,371