Document And Entity Information (USD $)	12 Months Ended
	Dec. 29, 2012	Feb. 01, 2013	Jun. 29, 2012
Entity Information [Line Items]
Entity Registrant Name	CERNER CORP /MO/
Entity Central Index Key	0000804753
Document Type	10-K
Document Period End Date	Dec. 29, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-29
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		172,207,737
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 12,351,700,511