Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Income Statement [Abstract]
Net sales	$ 563.5	$ 621.7	$ 1,042.5	$ 1,194.1
Cost of sales	347.9	401.2	652.7	776.6
Gross profit	215.5	220.6	389.8	417.5
Selling and administrative expenses	211.0	189.7	378.9	366.1
Restructuring and impairment charges	8.1	1.0	8.1	1.0
Operating income (loss)	(3.6)	29.9	2.9	50.3
Interest expense, net	5.5	2.1	8.2	4.1
Income (loss) before income taxes	(9.0)	27.8	(5.3)	46.2
Income taxes	3.8	(2.5)	6.0	1.8
Net income (loss)	(12.8)	30.3	(11.3)	44.5
Less: Net income (loss) attributable to non-controlling interest	(0.0)	0.0	(0.0)	(0.0)
Net income (loss) attributable to HNI Corporation	$ (12.8)	$ 30.3	$ (11.3)	$ 44.5
Average number of common shares outstanding – basic (in shares)	43.3	41.8	42.4	42.1
Net income (loss) attributable to HNI Corporation per common share – basic (in dollars per share)	$ (0.30)	$ 0.73	$ (0.27)	$ 1.06
Average number of common shares outstanding – diluted (in shares)	43.3	42.4	42.4	42.7
Net income (loss) attributable to HNI Corporation per common share – diluted (in dollars per share)	$ (0.30)	$ 0.72	$ (0.27)	$ 1.04
Foreign currency translation adjustments	$ (0.0)	$ (1.3)	$ 0.0	$ (1.8)
Change in unrealized gains (losses) on marketable securities, net of tax	(0.1)	(0.1)	0.1	(0.5)
Change in derivative financial instruments, net of tax	0.0	0.1	(0.1)	1.0
Other comprehensive income (loss), net of tax	(0.1)	(1.3)	0.0	(1.3)
Comprehensive income (loss)	(12.9)	29.0	(11.2)	43.1
Less: Comprehensive income (loss) attributable to non-controlling interest	(0.0)	0.0	(0.0)	(0.0)
Comprehensive income (loss) attributable to HNI Corporation	$ (12.9)	$ 29.0	$ (11.2)	$ 43.1