Document And Entity Information	6 Months Ended
	Jun. 30, 2012	Jul. 23, 2012
Document And Entity Information [Abstract]
Entity Registrant Name	CERNER CORP /MO/
Entity Central Index Key	0000804753
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-29
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		171,177,947