Document And Entity Information (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Aug. 17, 2012	Dec. 31, 2011
Document And Entity Information [Abstract]
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
Entity Common Stock, Shares Outstanding		27,287
Document Period End Date	Jun. 30, 2012
Document Fiscal Year Focus	2012
Current Fiscal Year End Date	--06-30
Entity Public Float			$ 1,275,242
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	Yes