Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Income Statement [Abstract]
Net sales	$ 621.7	$ 510.5	$ 1,194.1	$ 994.7
Cost of sales	401.2	322.6	776.6	626.9
Gross profit	220.6	187.9	417.5	367.8
Selling and administrative expenses	189.7	163.2	366.1	320.5
Impairment charges	1.0	0.0	1.0	0.0
Operating income	29.9	24.7	50.3	47.3
Interest expense, net	2.1	1.9	4.1	3.6
Income before income taxes	27.8	22.8	46.2	43.7
Income taxes	(2.5)	5.4	1.8	11.2
Net income	30.3	17.4	44.5	32.4
Less: Net income (loss) attributable to non-controlling interest	0.0	(0.0)	(0.0)	(0.0)
Net income attributable to HNI Corporation	$ 30.3	$ 17.4	$ 44.5	$ 32.4
Average number of common shares outstanding – basic (in shares)	41.8	43.8	42.1	43.5
Net income attributable to HNI Corporation per common share – basic (in dollars per share)	$ 0.73	$ 0.40	$ 1.06	$ 0.75
Average number of common shares outstanding – diluted (in shares)	42.4	44.5	42.7	44.0
Net income attributable to HNI Corporation per common share – diluted (in dollars per share)	$ 0.72	$ 0.39	$ 1.04	$ 0.74
Foreign currency translation adjustments	$ (1.3)	$ 0.2	$ (1.8)	$ 0.1
Change in unrealized gains (losses) on marketable securities, net of tax	(0.1)	(0.0)	(0.5)	(0.1)
Change in derivative financial instruments, net of tax	0.1	0.1	1.0	0.4
Other comprehensive income (loss), net of tax	(1.3)	0.3	(1.3)	0.3
Comprehensive income	29.0	17.7	43.1	32.8
Less: Comprehensive income (loss) attributable to non-controlling interest	0.0	(0.0)	(0.0)	(0.0)
Comprehensive income attributable to HNI Corporation	$ 29.0	$ 17.7	$ 43.1	$ 32.8