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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 01, 2023	Sep. 30, 2023	Oct. 01, 2022
Kimball International, Inc. Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock available for issuance (in shares)		1,100,000
Non-vested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value replacement awards		$ 13.8	$ 7.0
Non-vested restricted stock units | Kimball International, Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value replacement awards	$ 6.1
Fair value replacement awards (as a percent)	48.00%

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