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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 30, 2023 | Dec. 31, 2022 | Jan. 01, 2022 | Jan. 02, 2021 | Dec. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted (shares) |  | 0 | 0 | 0 |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) |  |  |  | 3 years |
Unrecognized compensation cost | $ 4.0 |  |  |  |
Nonvested stock, weighted average recognition period | 9 months 18 days |  |  |  |
PSU |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) | 3 years |  |  | 3 years |
Unrecognized compensation cost | $ 7.4 |  |  |  |
Nonvested stock, weighted average recognition period | 1 year |  |  |  |
Nonvested Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost | $ 0.0 |  |  |  |
Cliff vesting | RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) |  |  |  | 3 years | 3 years
Kimball International, Inc. Stock Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Available for future issuance (shares) | 1,100,000 |  |  |  |
The Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Available for future issuance (shares) | 3,200,000 |  |  |  |
2023 Kimball International Legacy Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercised period (years) | 10 years |  |  |  |
2023 Kimball International Legacy Plan | Cliff vesting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) | 4 years |  |  |  |

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