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Retirement Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock contribution	$ 3.9	$ 5.1	$ 7.1
Cash contribution	25.9	25.1	17.8
Total annual contribution	29.8	$ 30.1	$ 25.0
2023 Kimball International Legacy Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash contribution	$ 4.8

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