| Cover | Sep. 30, 2020 | Aug. 01, 2020 |
| Entity Information [Line Items] | ||
| Entity Registrant Name | KIMBALL INTERNATIONAL, INC. | |
| Document Type | 8-K | |
| Document Period End Date | Sep. 30, 2020 | |
| Entity File Number | 0-3279 | |
| Entity Central Index Key | 0000055772 | |
| 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 Incorporation, State or Country Code | IN | |
| City Area Code | 812 | |
| Local Phone Number | 482-1600 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Trading Symbol | KBAL | |
| Title of 12(b) Security | Class B Common Stock, par value $0.05 per share | |
| Security Exchange Name | NASDAQ | |
| Amendment Flag | false | |
| Entity Emerging Growth Company | false | |
| Entity Address, Postal Zip Code | 47546-2256 |
