Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 01, 2012	Jan. 21, 2013	Jun. 02, 2012
Entity Information [Line Items]
Entity Registrant Name	CLARCOR INC.
Entity Central Index Key	0000020740
Current Fiscal Year End Date	--12-01
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 01, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q4
Amendment Flag	false
Entity Common Stock, Shares Outstanding		49,614,725
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2,396,337,260