Cover - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Jun. 30, 2023	Aug. 01, 2023	Dec. 31, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jun. 30, 2023
Current Fiscal Year End Date	--06-30
Document Transition Report	false
Entity File Number	000-04065
Entity Registrant Name	Lancaster Colony Corporation
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	13-1955943
Entity Address, Address Line One	380 Polaris Parkway
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Westerville
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	43082
City Area Code	(614)
Local Phone Number	224-7141
Title of 12(b) Security	Common Stock, without par value
Trading Symbol	LANC
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 3,821.3
Entity Common Stock, Shares Outstanding		27,528
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement to be filed for its November 2023 Annual Meeting of Shareholders are incorporated by reference into Part II and Part III of this Annual Report on Form 10-K.
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Central Index Key	0000057515
Document Fiscal Year Focus	2023