Document and Entity Information (USD $)	12 Months Ended
	Dec. 03, 2011	Jan. 23, 2012	May 28, 2011
Document and Entity Information [Abstract]
Entity Registrant Name	CLARCOR INC.
Entity Central Index Key	0000020740
Current Fiscal Year End Date	--12-03
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 03, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q4
Amendment Flag	false
Entity Common Stock, Shares Outstanding		50,263,104
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2,096,506,866