Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales	$ 2,526.4	$ 2,434.0	$ 2,361.8
Cost of sales	1,493.0	1,485.7	1,526.9
Gross profit	1,033.4	948.3	834.9
Selling and administrative expenses	820.7	813.2	723.4
Gain on sale of subsidiary	0.0	0.0	(50.4)
Restructuring and impairment charges	6.2	44.8	6.7
Operating income	206.5	90.3	155.2
Interest expense, net	27.2	25.5	8.8
Income before income taxes	179.3	64.8	146.4
Income tax expense	39.8	15.6	22.5
Net income	139.5	49.2	123.9
Less: Net income (loss) attributable to non-controlling interest	0.0	0.0	0.0
Net income attributable to HNI Corporation	$ 139.5	$ 49.2	$ 123.9
Average number of common shares outstanding – basic (in shares)	47.4	44.5	41.7
Net income attributable to HNI Corporation per common share – basic (in dollars per share)	$ 2.95	$ 1.11	$ 2.97
Average number of common shares outstanding - diluted (in shares)	48.5	45.4	42.2
Net income attributable to HNI Corporation per common share – diluted (in dollars per share)	$ 2.88	$ 1.09	$ 2.94
Foreign currency translation adjustments	$ (0.4)	$ (0.2)	$ (5.7)
Change in unrealized gains (losses) on marketable securities, net of tax	0.1	0.4	(0.7)
Change in pension and post-retirement liability, net of tax	1.1	(0.0)	4.3
Change in derivative financial instruments, net of tax	1.6	(2.8)	0.8
Other comprehensive income (loss), net of tax	2.4	(2.6)	(1.3)
Comprehensive income	141.9	46.6	122.6
Less: Comprehensive income (loss) attributable to non-controlling interest	0.0	0.0	0.0
Comprehensive income attributable to HNI Corporation	$ 141.9	$ 46.6	$ 122.6