Document And Entity Information (USD $)	12 Months Ended
	Jun. 30, 2011	Aug. 17, 2011	Dec. 31, 2010
Document And Entity Information
Document Type	10-K
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Central Index Key	0000057515
Entity Registrant Name	LANCASTER COLONY CORP
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2011
Entity Common Stock, Shares Outstanding		27,341,000
Document Period End Date	Jun. 30, 2011
Current Fiscal Year End Date	--06-30
Entity Public Float			$ 1,074,883,000
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	Yes