Document And Entity Information - shares	9 Months Ended
	Sep. 29, 2018	Oct. 17, 2018
Entity Information [Line Items]
Entity Registrant Name	CERNER CORP /MO/
Entity Central Index Key	0000804753
Document Type	10-Q
Document Period End Date	Sep. 29, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-29
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		329,488,284