Cover - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Aug. 23, 2021	Dec. 31, 2020
Document Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jun. 30, 2021
Current Fiscal Year End Date	--06-30
Document Transition Report	false
Entity File Number	0-3279
Entity Registrant Name	KIMBALL INTERNATIONAL, INC.
Entity Incorporation, State or Country Code	IN
Entity Tax Identification Number	35-0514506
Entity Address, Address Line One	1600 Royal Street
Entity Address, City or Town	Jasper
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	47546-2256
City Area Code	(812)
Local Phone Number	482-1600
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Entity Public Float - Class B			$ 432.3
Entity Central Index Key	0000055772
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Small Business	false
Class A Common Stock
Document Information
Entity Common Stock, Shares Outstanding		187,939
Class B Common Stock
Document Information
Entity Common Stock, Shares Outstanding		36,659,367