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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
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