Document And Entity Information - shares	9 Months Ended
	Mar. 31, 2017	Apr. 20, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000057515
Entity Registrant Name	LANCASTER COLONY CORP
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		27,443,091
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Current Fiscal Year End Date	--06-30